Couple of questions to get us going:
- Could you provide more details on when/where exactly do you get this error? When you open your workbook?
- What Tableau version are you using?
- What do are you connecting to? Extract or live?
- Can you share workbook and/or log file?
We met at TC16 and you helped me with a workaround that was related to this. I am having this same problem. The problem refers to a table created by a union, and it occurs when trying to refresh an extract. It will generally work for a a couple of refreshes and then begin to return this error. I have had this problem on 10.0.4,5,6,and 7. I cannot upgrade to 10.1 due to my enterprise server. I am generally able to work around the error by deleting the extract and completely rebuilding the union and the joins, but I am now stuck with a broken file. I have seen this error on the forums in a couple of places and has yet to be addressed appropriately.
Exactly the same problem here - UNIONed tables as well. Cleaning up temp dirs and caches only sometimes and only for limited period of time remedies this issue. Tableau Desktop 10.0.9, not upgraded for the same reasons as Brian. A "workign workaround" would be highly appreciated.