Subscript out of range when addressing worksheet

Why does this fail with a subscript out of range error? The worksheet "January" exists.

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I do not see any error with the line, and the error might be somewhere else in the code

I can take out all of the other code to leave just the following, and still get the error.

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There may be a space on Worksheets("January") name
Copy the sheet name from excel and paste it in to the code(Not manually)

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Yup - January had a trailing space.