Encountered issues when migrating to CMSSW_7_4_X

• New MINIAOD 74X workbook here
• Namechange of b-tagging variables (implemented as jet.bDiscriminator(“name”)), see Jets
• ak8PFJetsCHSPrunedLinks –> ak8PFJetsCHSPrunedMass
• ak8PFJetsCHSSoftDropLinks –> ak8PFJetsCHSSoftDropMass

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")

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

Change of certain variable names:
jetAK8_prunedmassUnCorr –> jetAK8_prunedmass
jetAK8_softdropmassUnCorr –> jetAK8_softdropmass
nsubjets –> nsoftdropsubjets