Monster Hunter Portable 3rd HD VER

[nc50lc]

Nope, you can't use your current SAVESTATE.
The only way to fix no memory card error is start the game from normal in-game save. (the last normal save you have) Start the game using the normal way and you should be able to save normally again.
It's a bad news for you if you're using only SAVESTATEs from the start.