Parse error: in C:\pub\sacpla\wp\wp-includes\theme.php on line 2968

Fatal error: Uncaught Error: Call to a member function set() on null in C:\pub\sacpla\wp\wp-includes\l10n.php:857 Stack trace: #0 C:\pub\sacpla\wp\wp-includes\l10n.php(960): load_textdomain() #1 C:\pub\sacpla\wp\wp-includes\class-wp-fatal-error-handler.php(49): load_default_textdomain() #2 [internal function]: WP_Fatal_Error_Handler->handle() #3 {main} thrown in C:\pub\sacpla\wp\wp-includes\l10n.php on line 857