What's wrong with my dirt bike? - 2

It won't change from 1st gear to second gear, when I try to change gears into second it just goes back to neutral. I'm pushing the gear changing up enough hat it should be changing into second but it just won't. And yes I'm using the clutch when I change gears.

I started to get this problem with my bike (Honda) when I got stuck going up a super steep and slippery hill at a motocross place. Anybody know?

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