histwin warning: "DM is already defined"

I just installed histwin for the first time to try it out. When I start vim, it immediately gives a warning: "histwin: DM is already defined. May be by another Plugin?". It doesn't seem to affect anything that histwin does, although I've not gone through and tried every other function of every other plugin I have, so I don't know if anything else is affected. How can I debug or resolve this?

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