error and warning

hello
I installed the plugin version 1.3.575.
But in WordPress admin, I see warning and error.
What should I do?
Warning: fopen(/home1/llcigrou/public_html/wp-content/plugins/locateandfilter//cache/path2root): failed to open stream: No such file or directory in /home1/llcigrou/public_html/wp-content/plugins/locateandfilter/admin/class-locate-and-filter-admin.php on line 75

Warning: fwrite() expects parameter 1 to be resource, boolean given in /home1/llcigrou/public_html/wp-content/plugins/locateandfilter/admin/class-locate-and-filter-admin.php on line 77

Warning: fclose() expects parameter 1 to be resource, boolean given in /home1/llcigrou/public_html/wp-content/plugins/locateandfilter/admin/class-locate-and-filter-admin.php on line 90

Warning: Cannot modify header information – headers already sent by (output started at /home1/llcigrou/public_html/wp-content/plugins/locateandfilter/admin/class-locate-and-filter-admin.php:75) in /home1/llcigrou/public_html/wp-includes/functions.php on line 6221

Warning: Cannot modify header information – headers already sent by (output started at /home1/llcigrou/public_html/wp-content/plugins/locateandfilter/admin/class-locate-and-filter-admin.php:75) in /home1/llcigrou/public_html/wp-admin/includes/misc.php on line 1282

Warning: Cannot modify header information – headers already sent by (output started at /home1/llcigrou/public_html/wp-content/plugins/locateandfilter/admin/class-locate-and-filter-admin.php:75) in /home1/llcigrou/public_html/wp-admin/admin-header.php on line 9

Error : Please add write permissions on the following directory : /home1/llcigrou/public_html/wp-content/plugins/locateandfilter/cache

thanks

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