[Zope] VersionLockError: version object no longer exists

[Randy McLaughlin]

While working through the tutorial and introductory exercises, I appear to 
have pointed myself into a corner.  I worked some versioning examples and 
thought I had closed the version.  I resumed my study and eventually 
returned to Zope to try adding a new object in the root folder.  This 
resulted in a VersionLockError message and stack dump.  I think I've 
figured out that this is a rather dramatic way of saying "this folder is 
locked by another version".  I'm not sure how the root folder ended up 
locked, but it does show that icon.

I then tried to undo my way out of the problem.  This undid the creation of 
the version object, but not the objects locked by it.  Now I can't get into 
the version, because the version does not exist.  I tried creating a new 
version object by the same name and was able to do so but it did not end up 
being associated with the locked folder.

It would be easy to simply uninstall Zope and reinstall it.  I have nothing 
invested in the current configuration.  But I am uneasy about the 
possibility of this happening later when I do have a site built and in 
production.  I also suspect I will not be the last one bit by this problem.