Currently Getting this Error when submitting my Ajax Upload Form

[StanleyBonhomme]

Currently Getting this Error when submitting my Ajax Upload Form. Any idea as to why?

[ArtemisMir]

The error occurs due to the use of special characters in field names, such as name="Europe/Berlin"
Solution:
/plugins/martin/forms/classes/BackendHelpers.php:82
$pattern = '/{{\s*('.preg_quote($pattern, '/').')\s*}}/';