"Query execution failed" error for custom ssrs report

Hello,

I am trying to get my (first ever) report running in Tessitura. The stored procedure is fine. The report previews in visual studio just fine and looks as I want it to.

I built the report in Tessitura only to get an execution error:

  • An error has occurred during report processing. (rsProcessingAborted)
    • Query execution failed for dataset 'AvailableSeatsReport'. (rsErrorExecutingCommand)
      • For more information about this error navigate to the report server on the local server machine, or enable remote errors

Has anyone encountered this before? I set permissions to be the same as other reports. And as I said the SQL code is fine so I'm at a loss. I tried to track down the error on the report server (as per the error message) but I couldn't find log, or I don't have permission.

For what it's worth I am very new to Tessitura. I've attached a screenshot of my setup in Tessitura, in case that comes into play (apologies for quality, hopefully it's legible).

Thank you for any help or leads you can provide,

Ian