Flutter cannot switch channel

Question

My flutter works fine with stable channel, but when switching to another channel it ended up with find: invalid mode '+100'

Everytime I run this command :

> flutter channel master
> flutter doctor

is always end up downloading a git and the error with message :

find: invalid mode ‘+100’

I have run :

git clean -xfd
git pull
flutter doctor

but always end up with same error message, here's the screenshot:

Any idea what's wrong with my flutter ?

Solution

I just discovered that this problem is related to find, not flutter. I had a non-standard version of find installed, and after removing its directory from my PATH, updating flutter worked fine.

(I'm on macOS, and my problematic find came from the gnutls package, provided by MacPorts, and was located inside /opt/local/libexec/gnutls.)