Error when installing plugin

Hey there

When I install and activate the plugin, I get the following error. I need to de-activate the plugin to be able to use my site.

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 293

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 303

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 459

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 462

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 525

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 726

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 729

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 739

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 749

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 826

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 840

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 868

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 872

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 916

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 931

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 976

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 1004

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 1004

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 1005

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 1059

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 1060

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 1068

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 1068

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 1077

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 1227

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 1242

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 1265

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 1265

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 1322

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 1365

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 1382

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 1382

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 1413

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 1489

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 1496

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 1508

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 1621

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 1629

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 1634

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 1639

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 1640

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 1642

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 1650

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 1650

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 1651

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 1740

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 1795

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 1809

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 1926

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 1927

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 1944

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 2019

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 2020

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 2022

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 2029

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 2072

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 2094

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 2113

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 2114

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 2116

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 2123

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 2198

Deprecated: Array and string offset access syntax with curly braces is deprecated in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php on line 2726

Warning: session_start(): Cannot start session when headers already sent in /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Core/TCG_Plugin.php on line 25

Warning: Cannot modify header information - headers already sent by (output started at /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php:976) in /home/littlewo/public_html/wp-includes/functions.php on line 6221

Warning: Cannot modify header information - headers already sent by (output started at /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php:976) in /home/littlewo/public_html/wp-admin/includes/misc.php on line 1259

Warning: Cannot modify header information - headers already sent by (output started at /home/littlewo/public_html/wp-content/plugins/the-courier-guy/Includes/php-barcode-generator-master/src/BarcodeGenerator.php:976) in /home/littlewo/public_html/wp-admin/admin-header.php on line 9