I looked all around for a resolution to this problem and everyone pointed to the same setting.
Under Dynamics 365 > Options :
Make sure under the Dynamics 365 > Debugging section, make sure that "Load symbols only for items in the solution" is NOT checked.
So I did that, but still continued to get this error when attempting to debug.
There is another setting that you need to check.
It is in VS under Tools > Options. Go to the Debugging > Symbols section and make sure that Automatically load symbols for :
"All modules, unless excluded" is selected!
