Thanks for the picture, It will help. Do you know where (in which VI) the error occurs ? On your picture I see 2 VI : "New Report.vi" and "Excel Get Worksheet" - and I am not sure that the error message is related to these VI..To know where the error occurs put a probe on the error cluster between each VI and you will find the first "No OK".By the way did you have "Dispose Report.vi" at the end of your program ?Have a good day on the other side of the planet !Regards,Chris