What line of code generates this error?

>I have an application that runs successfully on several machines on a variety of Windows versions. I sent my application to a user in Thailand. It installs and runs OK, but as soon as she tries to save to a table she gets "Data type mismatch. Cancel Ignore".
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>This is running under vfp6 SP3 Runtime.
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>I got her to install on a Win98 and Win2K machine and she gets the same problem. Is there a problem with running an App in Thailand? Is there anything I can do?
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>Cyril.