Where oExp comes from?

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>In a Try/Catch block, in the Catch I've got the line
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>If oExp.ErrorNo = 1466
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>VFP is giving me the error of "Variable oExp.ErrorNo not found, yet there are plenty of examples where the ErrorNo is being referenced in the help files and when I look at the object in the debug window, I see a value for ErrorNo.
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>I'm a wee bit confused here - what is VFP trying to tell me?
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>Dorris