Error message: * Assertion at ..\mono\mini\unwind.c:620, condition `cfa_reg != -1' not met

After I upgraded from Unity 5.4 to 5.6, I am getting this error:
“message * Assertion at …\mono\mini\unwind.c:620, condition `cfa_reg != -1’ not met”

I even uninstalled the old Unity from my laptop and did a clean installation for Unity 5.6, but still getting this message.

Please help!

Same problem here.