Error

Check whether a public network, such as a school network, is blocking RestocksAIO.

The generic "Error" message means RestocksAIO could not reach the marketplace the way it expects, and the usual cause is the network you are on.

Make sure you are not on a public network, such as a school network - many of them block the connections the app needs
Switch to a private network and retry

If the app is set to use proxies but the proxy list is empty, the message is more specific: There's no available proxies for the current assignation. When the connection fails outright, the status code pages cover it: Status Code: None and Status Code: Too Many Requests.