So I have an app that was built by vendors, they did everything including submitting the app for the app store. So now I did slight modification to the app and want to update it in the app store. However, an error message pop shows up when we try to archive the app in XCODE. It first says that the team doesn't match then prompt me to click fix it, I clicked fix it but finally it shows this message: your account has a valid iOS distribution certificate but it is not installed locally.

What does this message mean? and how to fix it? This is my first hands-on experience in building ios apps and deploying them to xcode.