[datatable-help] Error: invalid type (closure) for the variable 'time'

[Tobic89]

Hey,

I just have trouble running a FE-Regression with the plm-package. I recieve
the following error:
"Error in model.frame.default(terms(formula, lhs = lhs, rhs = rhs, data =
data,  : invalid type for the variable 'time' "

Do you have an idea how to fix it?
I used the formula:





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