Illegal Leaf Message When Reading From A Database to Skim

[Diracula]

I’m using ROOT v 6.26/04 and this issue occurs when I’m trying to snapshot centrally produced NanoAODv9

I’m trying to read from a database to do a skim but everytime I do, I get this message:

Error in TBranch::TBranch: Illegal leaf: CorrT1METJet_area/CorrT1METJet_area[nCorrT1METJet]/F. If this is a variable size C array it’s possible that the branch holding the size is not available.
** Break ** segmentation violation
Error in TBranch::TBranch: Illegal leaf: CorrT1METJet_area/CorrT1METJet_area[nCorrT1METJet]/F. If this is a variable size C array it’s possible that the branch holding the size is not available.
** Break ** segmentation violation
Error in TBranch::TBranch: Illegal leaf: CorrT1METJet_area/CorrT1METJet_area[nCorrT1METJet]/F. If this is a variable size C array it’s possible that the branch holding the size is not available.
** Break ** segmentation violation
** Break ** segmentation violation
** Break ** segmentation violation

I understand this is a recent RDataFrame issue. Is there a workaround for it?

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[eguiraud]

Hi @Diracula ,

sorry for the trouble! That issue ([DF] RDataFrame confused by array variables in 6.26/04 · Issue #10920 · root-project/root · GitHub) was fixed in v6.26.06 (and it’s not present in v6.24).

In v6.26.06 you can work around it by manually specifying the list of columns to snapshot and taking care that nCorrT1METJet is listed before the CorrT1METJet_* columns.

I hope this helps!
Enrico