Revision as of 12:22, 16 April 2013 by Dan Poltawski (talk | contribs) (what to do)

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This error occurs when a new version of a plugin has been installed at some point and then has been replace by an older version of the same plugin.

In this scenario you need to determine what has caused this to happen. It might be that you've accidentally tried to install a version compatible with older versions of Moodle.