Deploying to Google Cloud App Engine

[SamuelAlev]

Hello,
I'm deploying my app to GC AE but I got this message :

PHP Notice: Google\Cloud\Core\Exception\GoogleException: Given keyfile path None does not exist in /app/vendor/google/cloud-core/src/ClientTrait.php:133 Stack trace: #0 /app/vendor/google/cloud-core/src/ClientTrait.php(99):

I didn't put any key_file env variable as in authentification point 4 it says :
If running in Google App Engine, the built-in service account associated with the application will be used.

In local everything works perfectly, I use the feature from authentification point 3 (with application_default_credentials.json).

Here is my env vars used in local and on GC AE
GOOGLE_CLOUD_PROJECT_ID: "my-app-id" GOOGLE_CLOUD_STORAGE_BUCKET: "my-app-bucket"

[SamuelAlev]

#61 Fixed the problem