SQL Server Reporting Studio report showing “ERROR#” or invalid data type error
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. I had an SSRS report where the query worked fine and displayed the string results I expected. However, when I tried to add that field to the report, it kept showing "ERROR#". I was eventually able to find a little bit more info: The Value expression used in [textbox] returned a data type that is not valid. But, I knew my data was valid. Found the answer here . Basically, it's a problem with caching and you need to delete