Error when uploading file

[moohook]

Hello, I get this error when uploading a file. How can this be fixed?

Updated with another error I just got: https://i.gyazo.com/434d2ef38c2f393612c5607739113138.png

 

[adam]

Hi,

Have a look in the browser console (F12) and monitor the network request. There might be some clues in the response.

Failing that, what have you changed recently? Is it a new server? Moved host etc?

Thanks,
Adam.