Can anyone help me solve this error? Thank you in advance
reprex (see the FAQ), all I can do is guess. Try renaming
Class to avoid a possible namespace clash with the functioning reading
class to mean the built-in function, rather than the data frame.
Screenshots are almost never helpful. Cut-and-paste output, at least.
Please follow @technocrat's advice.
In this case, it looks like you have passed
reg is the output of the previous regression. It's isn't dataframe.
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