If a version of Liferay Sync older than 1.2 was previously AND Liferay Portal is upgraded from 6.1 to 6.2, then Sync cannot connect to the portal.
To connect Liferay Sync to the portal, the settings must be reset. This will require re-syncing all files to a new liferay-sync home folder.
1) Go to "Add/Remove Programs" and uninstall Liferay Sync.
2) Reinstall Liferay Sync
1) Close Liferay Sync
2) Open Terminal and run the following command:
rm -rf ~/.liferay-sync
3) Open Liferay Sync