If you would like to just hide the errors until they are patched you can check the “Hide Microdata (hreview)” bock in the edit window of whatever rotators you have reviews on. It will however, stop google from finding your Rich results for testimonials. You can check that you have done this again using the tester https://search.google.com/test/rich-results which is quite handy. Then you can of course validate the fix in your search console.