'When using mice, I get Error in str2lang(x) : <text>:1:8: unexpected symbol

When the mice package for missing value imputation, I get the following error:

impute_vals = mice(cols, threshold = 1, m=1, maxit = 3, printFlag = TRUE)
Error in str2lang(x) : <text>:1:8: unexpected symbol
1: Clicks per
       ^

All columns are numerical. I'm not sure why it is not letting me run the MICE imputations.

Solution 1:^[1]

I changed to column name and this worked for me

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Solution	Source
Solution 1	Timothy D. Vines