the trainer messed up my savefile and now i cannot start monster hunter online anymore which is a problem because you need to be online in order for the trainer to validate you.
whenever i try to log in, it says "Detected an incorrect value in the save data"
so be careful everyone! i hope this can be fixed! i can only in offline mode now and cannot play online with my friends even if i dont launch the trainer.
Did you upgrade/craft anything with the easy crafting, if so and you made something that had a ??? in the smithy, it will throw this error
Try deleting such things, it worked for me when alatreon came out.
also always save your backup saves before doing stuff with a new trainer. hell back them up periodically anyways.