Recovering from deletions

I'm a little stuck. I deleted some folders and committed a version 21. I then reverted to version 19, I've tried various ways (merge being one) and all looks okay, but

when I Commit a new change to a routine I get :

Modified: Application Data\OptiPerl\Sessions\Scary\scan\bin\MSNSCodeAndLabelLex.pl
Error: Commit failed (details follow):
Error: File not found: transaction '21-1', path '/Scary/scan/bin/MSNSCodeAndLabelLex.pl'

and when I Update it it deletes my folders again and leaves me at version 21.

How do I force the latest version to be 19?

Scott
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