I've encountered an issue during the installation of a custom module in Odoo staging after merging the development branch. The module works flawlessly in the development environment, but upon merging to staging, I face difficulties installing it.

The error message displayed in the server logs is:

WARNING: The module content_plan cannot be downloaded

and the error message displayed in the Odoo interface is:

Invalid Operation
The module content_plan cannot be downloaded

Could anyone provide insights or guidance on why this issue might be occurring specifically after merging branches in the staging environment?