[Error message] Your Google Drive folder is missing. [Suggested steps] If you moved the Google Drive folder to a new place on your computer: Click the Google Drive icon in your computer’s toolbar. Select "Error - Google Drive folder is missing." Click Locate folder... Select your folder in its new location and click Open. Google Drive will reconnect. If you renamed your Google Drive folder: Click the Google Drive icon in your computer’s toolbar. Select "Error - Google Drive folder is missing." Click Locate folder... Select your renamed version and click Open. Google Drive will reconnect. If you deleted your Google Drive folder: Click the Google Drive icon in your computer’s toolbar. Select "Error - Google Drive folder is missing." Click Disconnect account. Sign in again. You will be asked to choose a new location for the Google Drive folder. [Likely reason] 
The error most commonly happens when you rename, move, or delete the Google Drive folder on your computer.