[R] lm regression

[effeesse]

Hi! My regression is lm(Y ~ A + B + C + D + E + F + G), where each covariate
"A--G" is of the kind "as.factor(column of the dataframe)".
I receive an error for the first explanatory variable "A": Error in  column
of the dataframe: wrong number of dimensions. What does it mean?
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