Why is Error 51 – cannot update without a Lock occurring?
Error 51 occurs where there has been an attempt to update a file, which is not locked, and the configuration item bLockRequired is set to ‘Y’ in the PFX.INI file (this is ‘Y’ by default in PFXplus version 5.0). In the interests of multi-user safety, we suggest that you take a look at the line(s) of code where the problem is occurring; most likely somewhere along the line, there is a save to a file(s), which is not locked. See article, for further information on multi-user programming.
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