Sir! I'm getting an error msg like this please help me solve this out. Above line contains erroneous data

Please attach the related STAAD.Pro model for the investigation. Thank you.

You need to add the PERFORM ANALYSIS command before the concrete design. Once this is done, you should not be getting any errors.

As mentioned before, you need to add the Perform Analysis command. To do that, go to the Analysis/Print vertical page and add the Perform Analysis command.