Assigments: Error creating new single assignment

Every time I create a new single assignment, it appears the following image. It doesn´t say anything else. This case happened recently when the IT Team installed Survey Solutions on the server of the Ministry. Before that, I never got that error when using the demo server. Please, any advice would be grateful!

Perhaps the error is not Survey Solutions related?
Our “not found” page looks like this:
(with or without a logout link, depending on whether you’ve hit an error while being logged in).

Talk to your ITs to explore the server response.

Best, Sergiy

@ncarranza ,

do you have any additional details about this?

I have already asked earlier to provide details about this error:

But so far nobody could provide anything informative.

Is the issue reproducible for your server??

Best, Sergiy