I would make sure this workflow rule is running on Project (in case you made it for Work Items). Please make sure "Only when a record is created" is set for the run-time, change evaluation criteria to "Always run" (unless you only want specific types of projects to trigger this), and kill the quotations on the $Comment*= portion of the New Note. I think the quotes are what is causing that error. Let us know if those changes work for you!
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