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Did you ever resolve where the "g" was coming from?
Are you using a disk (g:/)address instead of an http:// address?

Why do you think that?
Can you post ALL of the error message?

Where is it getting the G: from?

Does the error message have a source code line number in it? the 'etc.' in your post probably showed it.

Looks like some code is eating a full path as a URL: G:\folder\subfolder\...
URLs start with a protocol followed by a :
so G:\ would look like protocol G