Hi there SEBASTIANLEONC
I'm sorry you are receiving this unexpected error when adding images to a question, in a question bank. It sounds like there is something going on in the background. I recommend opening a case with Canvas Support by emailing: Support@instructure.com
You will want to include details like:
-The error ID you posted above
-A link to the course/page in Canvas where this is happening
-Screenshots (as attachments) of the error you see
-Any other details you find pertinent
Canvas Support will be able to take a closer look at this behavior you're experiencing, to provide steps on how to proceed. Thank you for your time and for posting in the community!