[waza75]

It are Floats, Try this code for instance

Код:

if (!strcmp("/jump", cmdtext))
  {
	SetPlayerVelocity(playerid,0.0,0.0,10.0); //Forces the player to jump
	return 1;
  }

Hope it will work

PS: You had it something like 100000000, make it in the code 10000000.0
.0 is needed I think.