[Hawkman]

But i didnt save the mission in Net ,campaign or single folders

That's why you can't save your missions.

KC is right - you must save missions into a sub folder in one of the 12 nationality folders under either Campaign, Net or Single in the Missions directory. I presume your test mission is an offline single mission, so it needs to go into a created sub-folder under Single. The created subfolders that come with the game are named after some of the a/c types for the different nations. I save my mission under a/c type, and simply manually create new folders for different types as I need them. For example: you create a single mission flying the Me410. If you're flying for Germany, the mission will go into Missions/Single/DE - and since there's no default folder for the Me410 in the DE folder, you simply create and name one and save your mission into that folder (you should do this before you go into the game to create and save the mission).

Hope this helps

Hawkers