This error message typically occurs when you try to use the \( operator on an object that is not a data frame or list. The \) operator is used to access elements of a data frame or list by their names, but it cannot be used on atomic vectors (such as numeric or character vectors).
To fix this error, make sure that you are using the $ operator on a data frame or list object that has named elements. If you are working with an atomic vector, use indexing instead (e.g., my_vector[1] to access the first element).
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