"Index was out of range" when two cells are merged

I receive this error during rendering when I have two cells merged together:

Error Snippet

Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index

When I "Split Cells" on the offending cells, it starts to work. This report renders without error when run on the RS server. This error only occurs when running the report locally on the "Preview" tab in the report designer.

I have closed the IDE and deleted the *.data files and restarted with the same results. Is there anyway to get more information about the error to help debug the problem?

Thanks!

~Jon

I would try copying the report content from your current report to the clipboard, deleting all of the content, and then pasting it back. This should allow the text boxes and such to be rebuilt and may clear up the issue. Keep a copy of the original RDL and compare the new (hopefully working) to the old.

Larry

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I found something...

It appears that I cannot merge cells in the top row in the Table Header. I can have merged cells in rows below the top row. Anytime I merge the cells on the top header row I get this index out of range error. I have no idea why. I tried it with another report and it works fine. It is just this particular report. The report is pretty simple. It does call a couple of subreports that are in the header. The crazy thing is that it renders with no problem on the RS server.

For now I just added a row at the top that doesn't contain any merged cells so that I can Preview locally as I work on the report.

~Jon