Could Not Attach to Pid:"####" Unable to Attach

Xcode 12.5.1 - Could not attach to pid: #### - Lost Connection

This problem might be related to the beta version of macOS that you use.

I suggest using the Xcode 13 Beta from Apple for developers.
You need a free apple developer account to access this download.

For me this solved all problems.

Can't sign in in Xcode: Couldn’t communicate with a helper application.

The problem you described started in Big Sur. It has been discussed extensively on github.

https://github.com/XVimProject/XVim2/issues/340

You'll be happy to know that this thread gives you a work-around, although it's a bit painful.

Mac M1 chip issues with rosetta, “attachment of code signature supplement failed: 1”

One of the following will fix the issue IMHO.

1. Restart Mac OS.
2. Upgrade OS (will restart after the upgrade)
3. Upgrade Docker, Upgrade OS, restart.

I had the same issue on Apple Silicon (M1Pro) running on Mac OS Monterey (12.0). I installed Rosetta2 and problem persisted. I deleted and reinstalled Docker but that did not fix the problem. After reading other answers on this question, I realized that for some people, OS upgrade was solving the problem.

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