Errors when installation

Hello, when I use the script, I get the following errors. I have searched for the source of this error but I have not found anything that would correct it.
- W: The repository 'https://packages.sury.org/php stretch Release' does not have a Release file.
- E: Failed to fetch https://packages.sury.org/php/dists/stretch/main/binary-amd64/Packages 403 Forbidden
- E: Some index files failed to download. They have been ignored, or old ones used instead.


I hope you can help me,
Sincerely.
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