Fatal error: Uncaught Error: Call to undefined function _system_rebuild_theme_data() in C:\xampp1\htdocs\sti\includes\theme.inc:800 Stack trace: #0 C:\xampp1\htdocs\sti\includes\theme.maintenance.inc(57): list_themes() #1 C:\xampp1\htdocs\sti\includes\bootstrap.inc(2945): _drupal_maintenance_theme() #2 C:\xampp1\htdocs\sti\includes\errors.inc(177): drupal_maintenance_theme() #3 C:\xampp1\htdocs\sti\includes\bootstrap.inc(2670): _drupal_log_error(Array, true) #4 [internal function]: _drupal_exception_handler(Object(Error)) #5 {main} thrown in C:\xampp1\htdocs\sti\includes\theme.inc on line 800