Laucher lists two warning in "Minecraft game output."

Game will load up to menu and I will select my Realm to launch. The Realm will then load up normally but before my character is placed into the Realm for me to begin playing the game crashes and takes me back to the launcher. A message saying "An unexpected issue occurred and the game has crashed. We're sorry for the inconvenience."

In the Minecraft game output I found two warnings;
Local file C:/Users\Mason\AppData\Roaming\.minecraft\assets\indexes/1.12.json has wrong SHA-1 hash, expected 3b666765bafa02e84e24b371d9efd7a4d1b6e188 but was c2ba0c4da30cce204c70db2ebc32a942cea8c7dd
and
Local installation of 1.12.2 (C:/Users\Mason\AppData\Roaming\.minecraft\versions\1.12.2\1.12.2.json) has wrong hash; expected d2b37e1f0657d4bb3129a807068ec9e751b479a8 but got 45ae520307a57185e7216714e0b038b7b335f1d2