Error when installing a new theme: failed to open stream and other error

Hi everybody ??

I really need your help to fix this problem with the installation of a new theme.
I purchase the Bard Pro theme, I installed it manually and with the zip file but the problem was the same. I’m working locally with WAMP server.

After the installation, I can see the site but at the top of the page I see these 3 messagges:

Warning: fopen(C:/wamp64/www/wordpress/wp-content/plugins/): failed to open stream: No such file or directory in C:\wamp64\www\wordpress\wp-includes\functions.php on line 4848

Call Stack
# Time Memory Function Location
1 0.0001 404536 {main}( ) …\index.php:0
2 0.0002 404824 require( ‘C:\wamp64\www\wordpress\wp-blog-header.php’ ) …\index.php:17
3 0.0002 405176 require_once( ‘C:\wamp64\www\wordpress\wp-load.php’ ) …\wp-blog-header.php:13
4 0.0003 405552 require_once( ‘C:\wamp64\www\wordpress\wp-config.php’ ) …\wp-load.php:37
5 0.0003 406920 require_once( ‘C:\wamp64\www\wordpress\wp-settings.php’ ) …\wp-config.php:91
6 0.0889 6376736 include( ‘C:\wamp64\www\wordpress\wp-content\themes\bard-pro-premium\functions.php’ ) …\wp-settings.php:426
7 0.0889 6378104 bard_freemius( ) …\functions.php:140
8 0.0899 6889776 fs_dynamic_init( ) …\functions.php:112
9 0.0899 6889776 Freemius::instance( ) …\start.php:502
10 0.0907 6890096 Freemius->__construct( ) …\class-freemius.php:2114
11 0.0918 6910520 Freemius->_version_updates_handler( ) …\class-freemius.php:487
12 0.0918 6910520 Freemius->get_plugin_version( ) …\class-freemius.php:609
13 0.0918 6910520 Freemius->get_plugin_data( ) …\class-freemius.php:8409
14 0.0918 6910520 get_plugin_data( ) …\class-freemius.php:8251
15 0.0918 6910520 get_file_data( ) …\plugin.php:84
16 0.0918 6910520 fopen ( ) …\functions.php:4848

Warning: fread() expects parameter 1 to be resource, boolean given in C:\wamp64\www\wordpress\wp-includes\functions.php on line 4851

1 0.0001 404536 {main}( ) …\index.php:0
2 0.0002 404824 require( ‘C:\wamp64\www\wordpress\wp-blog-header.php’ ) …\index.php:17
3 0.0002 405176 require_once( ‘C:\wamp64\www\wordpress\wp-load.php’ ) …\wp-blog-header.php:13
4 0.0003 405552 require_once( ‘C:\wamp64\www\wordpress\wp-config.php’ ) …\wp-load.php:37
5 0.0003 406920 require_once( ‘C:\wamp64\www\wordpress\wp-settings.php’ ) …\wp-config.php:91
6 0.0889 6376736 include( ‘C:\wamp64\www\wordpress\wp-content\themes\bard-pro-premium\functions.php’ ) …\wp-settings.php:426
7 0.0889 6378104 bard_freemius( ) …\functions.php:140
8 0.0899 6889776 fs_dynamic_init( ) …\functions.php:112
9 0.0899 6889776 Freemius::instance( ) …\start.php:502
10 0.0907 6890096 Freemius->__construct( ) …\class-freemius.php:2114
11 0.0918 6910520 Freemius->_version_updates_handler( ) …\class-freemius.php:487
12 0.0918 6910520 Freemius->get_plugin_version( ) …\class-freemius.php:609
13 0.0918 6910520 Freemius->get_plugin_data( ) …\class-freemius.php:8409
14 0.0918 6910520 get_plugin_data( ) …\class-freemius.php:8251
15 0.0918 6910520 get_file_data( ) …\plugin.php:84
16 0.0948 6911248 fread ( ) …\functions.php:4851

Warning: fclose() expects parameter 1 to be resource, boolean given in C:\wamp64\www\wordpress\wp-includes\functions.php on line 4854

I also can’t see, inside the backend of wordpress, the sidebar with posts, pages and everything.

Then, if I logout from wordpress and I try to enter again I see two new messagges, after the three that I’ve already mentioned. I report here the message:

Warning: Cannot modify header information – headers already sent by (output started at C:\wamp64\www\wordpress\wp-includes\functions.php:4848) in C:\wamp64\www\wordpress\wp-login.php on line 423

Warning: Cannot modify header information – headers already sent by (output started at C:\wamp64\www\wordpress\wp-includes\functions.php:4848) in C:\wamp64\www\wordpress\wp-login.php on line 436

Reading online it seems that this messages about headers are generated from the main error, the upper one. I wish that someone can help me fixing this thing ??

Thank you in advance,

Davide