Cache values may only be in one cache
This Error Reference applies to:
Plone 3.0.x, Plone 2.5.x, Plone 2.1.x
This Error Reference is intended for:
Any audience.
You get exception Cache values may only be in one cache when you are doing development on Zope.
Zope couldn't refresh your product correctly. This is due to Zope problems with dynamically reloading the code. Restart Zope.
Also, there is a workaround product developed for Zope2: RefreshNG.
Read more about the bug
.
Restart overkill (mostly)
Also, when the error occurs, retrying several times might make the operation succeed.