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Hello, I'm having this error on migrating between the two versions: 

call_user_func() expects parameter 1 to be a valid callback, class 'migration_279' not found

Image here: https://cloudup.com/ciDznuw88sY

Should I migrate one version at a time, in smaller steps?

Thank you very much

Ok I managed to have a smoother migration from 2.6.8 to 2.6.9 to 2.7.0.

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