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I get some errors. Any suggestion? I know WP but with php code I don't knwo anything

IS there a way to delete plugin and try to install it again?

Admin page

Warning: include_once(/problem-with-post-edit-buttonome/..../public_html/wp-content/sp-resources/forum-plugins/template-tags/library/sp-RecentPosts-widget.php) [function.include-once]: failed to open stream: No such file or directory in /problem-with-post-edit-buttonome/.../public_html/wp-content/sp-resources/forum-plugins/template-tags1/sp-template-tags-plugin.php on line 21

Warning: include_once() [function.include]: Failed opening '/problem-with-post-edit-buttonome/.../public_html/wp-content/sp-resources/forum-plugins/template-tags/library/sp-RecentPosts-widget.php' for inclusion (include_path='.:/usr/lib/php:/usr/local/lib/php') in /problem-with-post-edit-buttonome/.../public_html/wp-content/sp-resources/forum-plugins/template-tags1/sp-template-tags-plugin.php on line 21

Front pages:

Warning: include_once() [function.include]: Failed opening '/problem-with-post-edit-buttonome/...../public_html/wp-content/sp-resources/forum-plugins/template-tags/library/sp-RecentPosts-widget.php' for inclusion (include_path='.:/usr/lib/php:/usr/local/lib/php') in /problem-with-post-edit-buttonome/...../public_html/wp-content/sp-resources/forum-plugins/template-tags1/sp-template-tags-plugin.php on line 21

Warning: Cannot modify header information - headers already sent by (output started at /problem-with-post-edit-buttonome/...../public_html/wp-content/sp-resources/forum-plugins/template-tags1/sp-template-tags-plugin.php:21) in /problem-with-post-edit-buttonome/...../public_html/wp-content/plugins/wp-super-cache/wp-cache-phase2.php on line 89

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /problem-with-post-edit-buttonome/...../public_html/wp-content/sp-resources/forum-plugins/template-tags1/sp-template-tags-plugin.php:21) in /problem-with-post-edit-buttonome/...../public_html/wp-content/themes/yoo_balance_wp/warp/systems/wordpress/problem-with-post-edit-buttonelpers/config.php on line 48