The error message is "the requested database is currently being modified by another user. Please try again later.
usually this is a typical error linked to an empty selection (can be a screen dynamic selection based on an empty cube, or a selection on an entity which does not exist anymore in the database).
I suggest you to check follow thread where the topic has been already discussed
when i had this issue, 99% of times it was related to missing relationships: bottom-up or top-down.pay attention also to the time-tree relationships.
Retrieving data ...