====== Encountered issues when migrating to CMSSW_7_4_X ======

  * New MINIAOD 74X workbook [[https://twiki.cern.ch/twiki/bin/view/CMSPublic/WorkBookMiniAOD2015|here]]
  * Namechange of b-tagging variables (implemented as jet.bDiscriminator("name")), see [[https://twiki.cern.ch/twiki/bin/view/CMSPublic/WorkBookMiniAOD2015#Jets|Jets]]
  *ak8PFJetsCHSPrunedLinks --> ak8PFJetsCHSPrunedMass
  *ak8PFJetsCHSSoftDropLinks --> ak8PFJetsCHSSoftDropMass
==== Error message 1: ==== 
  Calling produce method for unscheduled module HadronAndPartonSelector/'patJetPartons'
  Exception Message:
  Principal::getByToken: Found zero products matching all criteria
  Looking for type: std::vector<reco::GenParticle>
  Looking for module label: genParticles
  Looking for productInstanceName: 
  ----- End SkipEvent Exception -------------------------------------------------
--Solution: In config.py: comment out line 343
  # process.load("PhysicsTools.PatAlgos.producersLayer1.patCandidates_cff")

==== Error message 2: ====   
  Exception Message:
  Unable to find plugin 'CandidateBoostedDoubleSecondaryVertexESProducer' in   category 'CMS EDM Framework ParameterSet Description'. Please check spelling of name.
  ----- End Fatal Exception -------------------------------------------------

--Solution: in CMSSW_7_4_1/src: 
  scram b distclean
  scram b -j8
  
==== OPS: BE AWARE!! ====  
Change of certain variable names:\\
jetAK8_prunedmassUnCorr --> jetAK8_prunedmass\\
jetAK8_softdropmassUnCorr --> jetAK8_softdropmass\\
nsubjets --> nsoftdropsubjets\\