Add Image in products Doesn t Work

The Latest WordPress Version
Schopperpress 7.1.3

Hi there

I have a problem that i cant add any images using the add image button on the post area, when i click the add image button a # is added at the end of my url but nothing happens besides that

It looks like this like this: https://www.mydomain.nl/wp-admin/post-new.php#

Anyone else have this problem?

Thanks

Dave