cms-sw/cmssw — pull request #5234 by nclopezo (2014-09-09 09:29:24+00:00)
Title: class version updated: root 5.34.20 changes the way it creates checksum ...

I am getting this error:

error: for class 'HEDarkening' ROOT says the ClassVersion is -1 but classes_def.xml says it is 1. Are you sure everything compiled correctly?

How can I fix it?