FSXA Can't create a misson following the SDK tutorial

I am a beginner in mission creation. I created a misson following the instructions of SDK, everything was the same as the tutorial, even the file name. However ,when I run FSX (the fight file has already been linked, the so-called "step 3" is done), the mission can't be found in the list. I spent a lot of time to check out why this happens, but until now I have not got the point.Waiting for your help.Thanks!
(My FSX version is acceleration,with SP1 installed )
azure_sky : What do you mean it was the txt compiler?
I am running into the same issue following the tutorials and I tried multiple text editors already with no luck.

FSX Acceleration SP2a