Editing with Composer Error

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I have just begun setting up a Concrete5.7.2.1 website. In all fairness this is my first try at 5.7. I have been using Concrete5 for a couple years, so I'm more than familiar with 5.6 and prior.

Every time I create a new page and then go back to edit it with Composer, just after I start typing my edit, I get a pop-up modal that says Error, but has a blank "Alert" when the error number should be. This happens every time I try to edit the page using Composer, I mean literally every time.

Any help would be greatly appreciated.

drumrby