There's an article worth to check Internal Consistancy Error by Craig Berntson at http://www.craigberntson.com/Articles/kb001.htm.

>Hi,
>
> My client gets an 'Internal Inconsistancy Error' in a program when he attempts to run a report. Not sure when the error occurs, as when I run it from in FoxPro to debug, the error doesn't occur.
>
> WinFox 2.6 on WinMe.
>
> A SQL select is performed before the report is run.
>
>Any ideas where I should start?
>
>Thanks.
>
>Daniel