First I would like to thank you all for your fast response.

By Resource files, do you mean the "config.fpw" file?
If that is the case, I use it.
On the other hand, I told the client to go to another option of my program that uses precisely the same tables I use on the one that is causing the error.

The client was able to open it, and all the options (insert, edit, delete) are working fine on the tables. That form is the only thing that is not working on my program... Menus, reports, and all the forms are fine.

Meanwhile, I did a search, and apparently the error IS a VFP error. Surprisingly, Microsoft DOES NOT have one reference to this error.

Any ideas?

Quickly going insane,