Problem:

In some cases you might run into an issue where when trying to copy databases between environments, enabling or disabling production mode that you get an error that says the following:

An unknown error occurred. Please try your request again. If the problem persists, contact Acquia Support. Request ID: [ ... ]

or

error: pathspec "tags/WELCOME" did not match any file(s) known to git.

If this started after a recent environment was provisioned (such as Remote Administration) this may be because the WELCOME tag is no longer available in your Acquia Git Repository.

Solution:

To correct this issue you can run the following commands in your local repository and then push to Acquia Cloud:

git tag WELCOME $(git rev-list --max-parents=0 master)
git push --tags

This will create the WELCOME tag for the first commit in the history of your repository.