After installing a Magento extension that implements a new class for a site and deploying this to an integration environment you see it is not working.
In the logs you discover the following error:
How do you fix this?
A . A support ticket should be riled with Magento Commerce Cloud to fix the filesystem issue
B . The extension should be modified so it does not write to generated at runtime
C . The file should be generated locally and pushed via Git
D . The generated_code_WRITABLE variable should be set to true whenever using extensions