'Trying to run a moderation analysis in R with multiple variables, but getting an error message

I'm trying to run setCor(Relconflict ~ dif * ï..ORG * Nation * LrelQ, data = Data2, zero = FALSE, std = FALSE, use = "complete")

while trying to run a moderation analysis but I get an error message:

Error in solve.default(x.matrix, xy.matrix) : system is computationally singular: reciprocal condition number = 2.57264e-20

The function works just fine for all the other variables but gives and error message when I include LrelQ

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