I have an issue around the use of filters in my report.
Environment is NPrinting 17.3.
I'm generating a excel report with 2 levels in it.
When I set a country or region filter the report generates fine.
When I set the filter to the user key which happens to be an email address I get the dreaded Sequence contains no elements error.
Can you point me in the direction of the inner exception details as the logs i've looked at are not very useful to troubleshoot with?
I know that this is not a direct answer to your issue, but i strongly suggest to upgrade. You are on very old, buggy version (i think you are like 12 versions behind!).
If you have not used the recent versions you are not even aware how much you are missing!
Troubleshooting your issue would also be easier by looking at task execution preview which would indicate what filter is not applied.
I agree with Lech. You must upgrade to the most recent version by following official instructions before to go ahead with the problem investigation. A log of bugs are solved between 17.3 and February 2019, some about filters so we must be sure that you are benefit of all of them before proceeding.