SQL Server Reporting Studio report showing “ERROR#” or invalid data type error

Question

I struggled with this issue for too long before finally tracking down how to avoid/fix it. It seems like something that should be on StackOverflow for the benefit of others.

Answer 1

Another solution to this issue is to click Refresh Fields in the Dataset Properties menu.

This will update the list of fields, and force SSRS to get new data, rather than relying on a cached version.