I recently had a maintenance call for my furnace from Enbridge/Enercare in Toronto, Canada. In the end they sent me an online survey of a couple of questions, which I dutifully answered. This resulted in this error message. It looks like a database insertion error.
An unexpected error has occurred!
Error Message: Invalid index (parameter 2) passed to Row function. Index must be less than or equal to the row count. Index Value: 1 Row Count: 0 Function: row(@rows,1)
Description: An unexpected error occurred during the execution of the page.