If you replaced the Excel file with another one of the same name, the problem is probably that some things have changed in its structure. If so, you need to walk through the data-definition wizard and adapt the configuration according to the new structure.
Senior Software Engineer
"A reasonable man adapts himself to the world. The unreasonable man persists in trying to adapt the world to himself. All progress, therefore, depends on the unreasonable man." (Bernard Shaw)