[aswinnarayanan]

When i edit any thing in Pawno and and click compile the amx file automatically delete

[Bingo]

Yes, Because it's in the process of compiling and when pawno finishes it's process you'll get gamemode.amx.

[Parallex]

If you get errors, it gets deleted. You need to fix the errors and then compile. Or else, see what Patrol has said.