Hi everyone,

I created a report with a Bar graph in it. I proceeded to creating the report and after it worked, I added a second dataset to it. Without even trying to use the fields from the second dataset, I went to the Preview section and I refreshed the report and got the following error:

An unexpected error occurred in Report Processing.
The expression referenced a non-existing field in the fields collection.

If I delete the second Dataset, the error goes away. Is this a Reporting Service bug, or am I doing something wrong?

Thank you in advance for any help!