Adding fields - Unable to process your request

Adding fields - Unable to process your request

Hi,

I've been trying to add some values to a field I created some months ago. The field is marked as mandatory and it already has other values set, but when I try to add two new values, I always get the "Unable to process your request" error. The same happens, for example, when trying to set a field to non-mandatory or editing any value on any other field.

The weird thing is that it only happens in just one department, and I have another 3 departments with a very similar configuration (similar fields and values), and there's no such error like the one Zoho shows me. It's worth to mention the department I'm getting the issue is the most recently created.

Why am I getting that error?