Xcode12 can run on the real machine, but the simulator runs an error

Xcode12 can run on the real machine, but the simulator runs an error

Solution: add simulator architecture,
find Build Settings-VALID_ARCHS and add x86_64 inside

This is a blogger's post (https://www.jianshu.com/p/3f740e5e9ec8)
The error I encountered is similar to this blogger’s

There is another kind of error report, no third party library can be found

But the solution is the same as adding x86_64,over to valid_archs.