Partition Magic: copy partition fails with error code 24

If using MiniTool Partition Wizard you fail to either copy or resize a partition due to "Error 24":

=========================== Welcome to Partition Wizard ========================

Loading Engine...

[...] 

Failed to executive [sic] this command. Running Status Error Code:24

[...]  

Running Status Error Code:24

Try this:
1. Check for the largest files on your partition using e.g. Windirstat and delete them or move to an outside storage.
2. Install and run e.g. Puran Defrag Tool, which forces defragmentation over the limits imposed by the standard Ms Windows Defrag.
3. Run Puran Defrag again and again ;)
4. Retry the copy operation with MiniTool Partition.