This website is out of sync with the {{environment.destination}} website you are trying to transfer to. That means that important components have been updated here or on the {{environment.destination}} website, but the changes have not been synced between the 2 websites.
To solve this problem, open your git console, and ensure that all changes have been pulled from {{environment.destination}} and that all your local changes have been committed and pushed.
Git commands:
/> git pull /> git add . /> git commit -am "My local changes" /> git push