An error occurred in the upload. Please try again later.

hello Friend
I really hope you can help me. I am sure that this is a theme problem cause I have tried everything possible.

The matter is that nobody, except the admin is enable to upload media files into media library. I have frontend post available and need to let my user to insert images into their post. I have tried numerous plugins because of the “An error occurred in the upload. Please try again later.” they are – User submitted post, WP user frontend, Frontier post, Frontier uploader… all of this have got the same problem, the user is unable to upload media file into library.

I have decativted all my plughins, I have 48 plugins installed and reactivated it one by one, it did not resolve the problem, I have re installed the wordpress, it did not resolved the problem, I check al capabilities, user are allowed to upload files… so, I guess, after suche research the only factor remains with my theme.