It wont let me play online, failing to load my skin, my horses with diamond armor despawned, all of my sheep despawned, game keep crashing with error -9. I'm getting very frustrated that everytime I log back into this world something else is gone

It wont let me play online, failing to load my skin, my horses with diamond armor despawned, all of my sheep despawned, game keep crashing with error -9. I'm getting very frustrated that everytime I log back into this world something else is gone