Runtime error 3421 is a data type conversion error - text in a numerical field etc. However, if there is no conflict in the data then it could be some kind of lock issue - the table is being locked, preventing update.
Sep 13, 2006
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What is runtime error 3421 in VBA?
Why am I getting a type conversion failure in Access?
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Mar 26, 2007 · Re: Run Time Error 3421 - Data Type Conversion Error. Yeah, it is whether varType or varSize that cause the error. Make sure they are valid.