Errors updating to PHP 7.2

Dear folks,

I am receiving the following error-messages while trying to update to PHP 7.2.

Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; general_setting_default_fb_thumb has a deprecated constructor in /customers/d/1/3/specimen.com/httpd.www/wp-content/plugins/facebook-thumb-fixer/_facebook-thumb-fixer.php on line 63 Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; general_setting_fb_app_ID has a deprecated constructor in /customers/d/1/3/specimen.com/httpd.www/wp-content/plugins/facebook-thumb-fixer/_facebook-thumb-fixer.php on line 137 Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; general_setting_object_type has a deprecated constructor in /customers/d/1/3/specimen.com/httpd.www/wp-content/plugins/facebook-thumb-fixer/_facebook-thumb-fixer.php on line 158 Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /customers/d/1/3/specimen.com/httpd.www/wp-content/plugins/facebook-thumb-fixer/_facebook-thumb-fixer.php:63) in /customers/d/1/3/specimen.com/httpd.www/wp-content/plugins/onecom-vcache/vcaching.php on line 104 Warning: Cannot modify header information - headers already sent by (output started at /customers/d/1/3/specimen.com/httpd.www/wp-content/plugins/facebook-thumb-fixer/_facebook-thumb-fixer.php:63) in /customers/d/1/3/specimen.com/httpd.www/wp-content/plugins/onecom-vcache/vcaching.php on line 522 Warning: Cannot modify header information - headers already sent by (output started at /customers/d/1/3/specimen.com/httpd.www/wp-content/plugins/facebook-thumb-fixer/_facebook-thumb-fixer.php:63) in /customers/d/1/3/specimen.com/httpd.www/wp-content/plugins/onecom-vcache/vcaching.php on line 524 Warning: Cannot modify header information - headers already sent by (output started at /customers/d/1/3/specimen.com/httpd.www/wp-content/plugins/facebook-thumb-fixer/_facebook-thumb-fixer.php:63) in /customers/d/1/3/specimen.com/httpd.www/wp-content/plugins/onecom-vcache/vcaching.php on line 529 Warning: Cannot modify header information - headers already sent by (output started at /customers/d/1/3/specimen.com/httpd.www/wp-content/plugins/facebook-thumb-fixer/_facebook-thumb-fixer.php:63) in /customers/d/1/3/specimen.com/httpd.www/wp-content/plugins/onecom-vcache/vcaching.php on line 531 Warning: Cannot modify header information - headers already sent by (output started at /customers/d/1/3/specimen.com/httpd.www/wp-content/plugins/facebook-thumb-fixer/_facebook-thumb-fixer.php:63) in /customers/d/1/3/specimen.com/httpd.www/wp-content/plugins/onecom-vcache/vcaching.php on line 156

Is there a fix because PHP 5.6 will expire begin of December with our provider?

Thank you all.

Warm regards from Germany