Can anyone help?

I have data in excel that I am needing to export to dbf (so that I can use crystal (report writer) to read it and print a report) ONly, Crystal telss me I have an xBase error - invalid field length.

Can anyone help? It was working fine but no matter what I do I can't seem to get it working again

Thanks

PS: The dbf file doesn't appear to have "memo" fields in the file although I don't kjnow what that means?