When trying to convert TACSH3 files to TCASH5 files I get the following errors:

1. ZQuery 3: Cannot perform this operation on a closed dataset

2. Directory is controlled by other .NET files

   Directory C:\


Can anyone please steer me in the right direction.



Views: 205

Comment by Retief Kotze on April 13, 2015 at 9:24

Hi Johan,

I can't directly answer your problem, but you need to convert from TC3 to TC5 by going via TC4.  There was a database change in TC4 that is handled in the TC4 opening a TC3-file.  This 'conversion' does not automatically happen in TC5.

If this does not solve the issue, I would suggest the following:

  • Post a new 'discussion' under 'Forum' in black bar at the top - this will reach a wider audience;
  • Also post in forum on
  • Also post in 'osFinancials'-forum. This is a fork from TC, with the most active programmers on the TC-environment (my opinion only), and they actively contribute to TC.


Comment by Philip Copeman on July 24, 2015 at 16:27

Delete the file PDOXUSRS.LCK and try again.

Comment by Cheryll Richter on March 30, 2016 at 13:54

With Version 4, came a Tcash 3 Conversion yes, you must run that conversion, then upgrade to version 4, and then vesion 5.

This is with most software. Always follow the versions systematically

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