error: cannot coerce type 'closure' to vector of type 'any'

When merging two dataframes i get the following error:

votes <- as.data.frame(RFM$votes)
origin <- as.data.frame(RFM$y)
colnames(origin)[1] <- 'origin'
fit_score <- merge(votes,origin, by.x=row.names, by.y=row.names)
Error in as.vector(x, mode) :
cannot coerce type 'closure' to vector of type 'any'

Does anyone understand the error and knows how to solve?

row.names is a function so its not an appropriate by.x or by.y parameter to merge with

Great, thanks! Solved the problem.

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