Even with a new and fresh install of X-Plane there is an error in the log (log.txt in the root of the X-Plane directory). 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 (see download) in the folder X-Plane 10\Resources\default scenery\airport scenery. It adds a folder (\Custom objects\test) with two files: AGtrees_test.for file and treeset_e.png. That’s all……(no more errors… ? )