Updating failed. The response is not a valid JSON response

I am a French web developer, i wanted to test Local by flyweell for my next client project but i directly have a big issue.

I have an error when i try to save a new post or page “Updating failed. The response is not a valid JSON response.”

-it’s a multisite with subdirectories

  • PHP version 7.4.1
  • Apache serveur
  • The Site Health status said that “the REST API encountered an unexpected result”

i am in Windows 10 19041.630

Is there a way to resolve this issue or i have to go back to my WSL2 local environement?
Thank you for you’r help!

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