Even with a new and fresh install of X-Plane 10 there is an error in the log (log.txt in the root of the X-Plane directory): the AGtrees_test.for error.
The error is caused by some X-Plane definitions in the resource library that refer to this file, while it is missing (at least at the location that is referred to). Although it doesn’t cause any serious problems I find it annoying and it doesn’t help when scanning the log for real errors.
I found a simple solution: place the missing files in the folder X-Plane 10\Resources\default scenery\airport scenery. It adds a folder (\Custom objects\test) with 2 files: AGtrees_test.for file and treeset_e.png.
That’s all……(no more errors… )