Error message but no script to edit

Hi,

I am seeing this error message:

"Error generating the page
Check whether the tablename is correct or the respective data-dictionary has been loaded."

No line or column position is mentioned and no script is displayed for editing.

I inserted a multi-select field that references a unique field in another table and found that the GUI looked OK but the script would not save (even when nothing had been modified). I then changed the multi-select to a single-select and got the error above. I have also tried to delete this field but despite the delete confirmation being given, the field won't delete.

Any ideas?

Thanks,
Anton