RSV-SRV-0003 Error

[NewGuy1983]

Hello, I'm receiving the below error when trying to merge two table cells. Can anyone tell me why I'm receiving this error?

RSV-SRV-0003 The report specification contains an error at line ' 55', column ' 344'.
Datatype error: Type:InvalidDatatypeValueException, Message:Value 'NaN' does not match regular expression facet '[+\-]?[0-9]+'.
RSV-SRV-0042 Trace back:
RSReportService.cpp(766): RSException: CCL_CAUGHT: RSReportService::processImpl()
RSReportServiceMethod.cpp(253): RSException: CCL_RETHROW: RSReportServiceMethod::process(): asynchRunSpecification_Request
RSASyncExecutionThread.cpp(873): RSException: RSASyncExecutionThread::checkException
RSASyncExecutionThread.cpp(317): RSException: CCL_CAUGHT: RSASyncExecutionThread::runImpl(): asynchRunSpecification_Request
RSReportDOMBuilder.cpp(265): RSException: CCL_THROW: RSReportDOMBuilder::doParse