Ola,
I think that You have the mentioned "Master_GDLRoofMaker 2.1gdl" in the PLA-archive AND in Your built-in ArchiCAD-library. Both of them is trying to configure the same calculation database and thus generating the error.
Just expand the PLA and delete the file "Master_GDLRoofMaker 2.1gdl" and the errors should be gone.
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Hope this helps.