How do I fix this error on Minecraft?

11:02:29	launcher	Preparing to launch minecraft client for Wurst MC 1.12
11:02:29	launcher	Couldn't get hash for Wurst MC 1.12 jar from https://s3.amazonaws.com/Minecraft.Download/versions/Wurst MC 1.12/Wurst MC 1.12.jar.sha1: HTTP 403: Forbidden
11:02:29	launcher	Have local file C:/Users\Riley_000\AppData\Roaming\.minecraft\versions\Wurst MC 1.12/Wurst MC 1.12.jar but don't know what size or hash it should be. Have to assume it's good.
11:02:30	launcher	Checking installations.
11:02:30	launcher	Minecraft client Wurst MC 1.12 is ready to start.
11:02:30	launcher	Starting!
11:02:31	launcher	Using default game log configuration client-1.12.xml (outputs XML)