How to fix repeated “an unknown issue occurred and Google Drive needs to quit” error?

I keep getting this error message when trying to sync a folder with Google Drive on my Windows 8 PC. Any suggestions on how to fix it?

For Macs:
1. Select “Quit Google Drive” from the sync client menu.
2. In Finder select “Go” –> “Go to Folder…”.
3. Enter this, exactly: ~/Library/Application Support/Google/Drive
4. Open the folder titled “cloud_graph”.
5. Delete the file titled “dict_2.db”.
6. Restart the desktop sync client.

For PCs:
1. Select “Quit Google Drive” from the sync client menu.
2. Select “Choose File”, and navigate to: %UserProfile%\AppData\Local\Google\Drive
3. Open the folder titled “cloud_graph”.
4. Delete the file titled “dict_2.db”.
5. Restart the desktop sync client.”

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Tags: error, Google Drive, issue, quit