Collection was modified; enumeration operation may not execute

Question

When connecting to a database from a client project in Studio2017 I get this message and I can't connect to their database. 
 Please advice

Lydia Simplicio · Answer

Hello Luisa de Tord , 
 
 Could you please post the error stack as this can help identify the issue-

Also can you tell us if your client is working with GroupShare and what type of data base you are trying to connect to please (ie TM/Termbase etc.).

Lydia Simplicio · Answer

Hello Luisa de Tord , 
 
I believe this error is being caused by the Termbase themselves (maybe skipping certain steps in the original project creation..) 
Please go in to the project settings and remove all the termbases and add them back in one at a time. 
If this fails- please remove again the TB's and recreate the project and ensure you go throufgh each step and dont skip any. 
 
Does this now work for you?

Trados GroupShare > 1. General

Collection was modified; enumeration operation may not execute