Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, function "einvoice_remove_roles" not found or invalid function name in /www/htdocs/w01dd2db/test.json-content-importer.com/wp-includes/class-wp-hook.php:324 Stack trace: #0 /www/htdocs/w01dd2db/test.json-content-importer.com/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array) #1 /www/htdocs/w01dd2db/test.json-content-importer.com/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #2 /www/htdocs/w01dd2db/test.json-content-importer.com/wp-settings.php(700): do_action('init') #3 /www/htdocs/w01dd2db/test.json-content-importer.com/wp-config.php(108): require_once('/www/htdocs/w01...') #4 /www/htdocs/w01dd2db/test.json-content-importer.com/wp-load.php(50): require_once('/www/htdocs/w01...') #5 /www/htdocs/w01dd2db/test.json-content-importer.com/wp-blog-header.php(13): require_once('/www/htdocs/w01...') #6 /www/htdocs/w01dd2db/test.json-content-importer.com/index.php(17): require('/www/htdocs/w01...') #7 {main} thrown in /www/htdocs/w01dd2db/test.json-content-importer.com/wp-includes/class-wp-hook.php on line 324