Cada vez que entro al iniciar el juego me aparece esto: Forge Mod Loader has found a problem with your minecraft installation,

The mods and versions listed below could not be found

radixcore : any

The file 'ForgeModLoader-client-0.log' contains more information

Despues cuando intento crear una nueva partida o ingresar a un mundo ya creado antes me aparece esto y no me deja jugar u.u:

Forge Mod Loader detected that the backup level.dat is being used

This may happen due to a bug or corruption, continuing can damage

your world beyond repair or lose data / progress.

It's recommended to create a world backup before continuing.