http://www.sqlservercentral.com/blogs/whatilearntatwork/2011/09/10/ssrs-2008-r2_3A00_-object-reference-not-set-to-an-instance-of-an-object/

Printed 2014/04/23 05:34PM

SSRS 2008 R2: Object reference not set to an instance of an object

By sureshkumar.d, 2011/09/10

We have a report in SSRS 2008 which calls multiple sub-reports. One of the sub-reports contains a data region (tablix)  in which one of the column is populated by another sub-report i.e. the sub-report will render for each row of the tablix. This report is working fine in 2008.

As part of migration to SSRS 2008 R2, I opened the report in BIDS 2008 R2 and hit the preview. The report rendered but the tablix column contained error Error:subreport could not be shown for each row.

Hitting The View -> Error List had the error

e ERROR: An error has occurred while processing a sub-report. Details: Object reference not set to an instance of an object.

After spending nearly two days in digging, I came across this KB Article which talks about similar issue in SSRS 2008. Though this is for SSRS 2008, the work-around mentioned in the article fixed the issue.  The solution is to place the main sub-report in a list control mapped to a dummy dataset with one row.



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