Cannot build project with Xcode 12.0 beta 4

I downloaded Xcode 12.0 beta 5 and I'm trying to build my project, but I received the following error:

<unknown>:0: error: unable to load standard library for target 'arm64-apple-ios9.0'

I tried searching online for solutions, but none of what I found helped me to solve this error. I found this thread on SO but none of the proposed solutions worked for me.

I think it's an error related to simulator. In fact, the project builds correctly with generic device and on a real device.

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