Best answer by Stanley_4
Error 1001 / Error 1002
These error messages occur when Sonos tries to add or connect to your music share, but the computer or NAS drive takes too long to respond. This can happen when the computer or NAS is having trouble maintaining a reliable connection to the network.
The most common causes of these errors are detailed above under “Common Issues and Solutions.” If you see this error, check your computer or NAS and make sure that it’s powered on and awake. If the computer is on WiFi, make sure it has a strong wireless connection to the router.
A firewall can also block Sonos from properly connecting to the computer. If a firewall is installed on the computer, make sure it’s configured for Sonos by following these steps.