The error log meant nothing to me and as such I posted on this forum.
I just said you could have used the search function and insert the error text as it is (without having to understand it), so you would have found the other thread I indicated, which explains why it happens.
I still cannot make the connection between the RuntimeError message and the message generated onscreen to download the Standalone Manager as a fix to this problem, since you are saying that this is most likely an ADE problem
The error message box will always tell you to download the Standalone Manager, regardless WHICH error you'll have.
This, to ensure you have the latest version of the code because, it might be possible that you have OTHER errors that might be real GSX's faults, and might have been corrected by the latest version of the code.
But THIS specific error, is a problem of the scenery, so it cannot be fixed by anyone other than the scenery author.
Or you, of course, if you know how to use ADE to fix error in sceneries.