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User.name has multiple values- need to fix

Dear Team:

I cannot change the user name because I already have 2 names in Git. See code: C:\Sites\projects\code\treebook>git config --global user.name "Chris Beyer" warning: user.name has multiple values error: cannot overwrite multiple values with a single value Use a regexp, --add or --replace-all to change user.name.

I also currently have another user..name.

What is best way to fix this to just my name.?

Note: I am doing this for a second time.

Any help woiuld be greatly appreciated.