Yup, I also have this bug 
I am just starting out with UE4 aand C++ so when the base code doesn’t work I have no clue what to do
Thankfully there are two solutions offered here: https://answers.unrealengine.com/questions/822711/atomich-error-in-all-new-projects.html
I’ll save you the read: Visual Studio no longer automatically casts enums to ints so all you have to do is prefix “UE4Atomic_Private” with a cast like so “(int)” and now Value becomes an int and everybody’s happy 