Nice link Giuseppin, and it tells us what?
Atoka, we're turning in circles.
Your log says:
java.lang.NullPointerException
at com.maddox.il2.gui.GUIQuick$ItemAir.<init>(GUIQuick.java:398)
That code section (lines 397 and 398) reads:
SectFile localSectFile = FlightModelMain.sectFile(str);
this.speedMin = localSectFile.get("Params", "Vmin", (float)this.speedMin);
And that means that "localSectFile" is null and that in turn means, that the game can't load the Flight Model for your plane.
I've told you that you probably need DiffFM to use that plane.
I've told you to use the forum search to find DiffFM.
You've told me that you would have searched, but didn't find anything.
Seriously?
You are using HSFX and you need DiffFM.
That's two search terms.
Try again.
I just did and it
does return the needed result.
I won't post the link here because I'm not there to feed you with a spoon.
Searching for two terms yourself shouldn't be asking for too much.
Last but not least, if your game is 4.12.2m, HSFX 7 (without patches) doesn't fit.
HSFX 7 is 4.12.1m.
HSFX 7.0.1, 7.0.2 and 7.0.3 are 4.12.2m.
If you want to play HSFX 7 (without patches), you need to install it on 4.12.1m.
If you want to install HSFX 7 on 4.12.2m, update it to HSFX 7.0.3.
Mike