Problem

Error in paste("Variable type cannot be changed from", varTypeOrig, "to", : argument "varName" is missing, with no default

Solution

The nameVarInfo object expects to be a list of variables with each variable in the list having a list of properties set, of which 'newName' is one. The correct way to set the nameVarInfo with updated column names would be:

nameVarInfo <- list(existingName1 = list(newName = "nameiwant1"), 
existingName2 = list(newName = "nameiwant2"), 
existingName3 = list(newName = "nameiwant3), 
...) 
rxSetVarInfoXdf(nameVarInfo, retStubxdf)

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