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MSFS20 INTERNAL COMPILER ERROR: #C2431: Unrecoverable error loading schema!

Fedeskid76

Fedeskid76

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italy
Hi Everyone!
I'm kinda a newbee in msfs2020 scenery editor , I tried few years ago and it went pretty good following strictly some tutorial online using Devmode inside game....
But now I'm getting a nightmare error #C2431 everytime I try to modificate my last works or making a new one ( Airports editing only )... I'm using last version of msfs2020 1.39.12.0 ( released 2/march/2026 ) and last version of SDK 0.24.5 . it looks like I got some problems with BGL file maybe?
Hopefully someone could help me to solve this issue 😩
many Thanks in advance!
Fede

Immagine 2026-08-24 100537.jpg


1787566892022.png
 
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You should zip the project and attach it here, or upload it to a cloud service so someone here can examine the files. Otherwise it's just a guess.
 
It compiles for me just fine. You are using the Steam version of the 2020 sim? There is a new version of the SDK now: 0.24.6 but that is not the problem. All compilation is done within the sim. The error you get is from an old FSX BGLComp error, so I'm not sure why that would be there, and it indicates the schema (BGLComp.xsd) could not be found. Although present in the SDK for reference, MSFS 2020 doesn't use the BGLComp.xsd in compilation.
The first thing I would do is to verify the files integrities:
Untitled.png
 
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rhumbaflappy said:
It compiles for me just fine. You are using the Steam version of the 2020 sim? There is a new version of the SDK now: 0.24.6 but that is not the problem. All compilation is done within the sim. The error you get is from an old FSX BGLComp error, so I'm not sure why that would be there, and it indicates the schema (BGLComp.xsd) could not be found. Although present in the SDK for reference, MSFS 2020 doesn't use the BGLComp.xsd in compilation.
The first thing I would do is to verify the files integrities:
View attachment 100749
Click to expand...
Yes I'm using the Steam version of msfs2020 , the new version of SDK you mentioned is not downloadable for me cos sys reply as follow:

1787583359211.png


Btw I'll let you know as soon as I made the integrity game test you suggested... thank you very much for now , keep you updated soon
 
Fedeskid76 said:
Yes I'm using the Steam version of msfs2020 , the new version of SDK you mentioned is not downloadable for me cos sys reply as follow:

View attachment 100750

Btw I'll let you know as soon as I made the integrity game test you suggested... thank you very much for now , keep you updated soon
Click to expand...
THANK YOU VERY MUCH ! I solved the problem now , by doing actions you suggested on steam...integrity of the game had been restored now works properly!!
 
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