Online upgrade from 2.4rc1

Just tried an upgrade of 2.4rc1 to 2.4 and getting the following:

Module Administration
Errors with selection:

* Core cannot be upgraded:
      o FreePBX version 2.4.0 or higher is required, you have 2.4.0rc1
  Please correct this error first.

No actions to perform

Update Framework first

Many Thanks, Works like a dream