This is the most useless error message I have ever seen.

I think it translates to .. "error".

The full error message from the *Messages* buffer is:

File mode specification error: (wrong-type-argument characterp "string value here")

I think the latter part of that message means that emacs was expecting a character and got a string.

But how do I go about diagnosing just what it means when emacs tells me "File mode specification error" ? and how do I narrow down where this error is originating?

How are these two errors (file mode error, expecting character and got string) related?

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