What can I do to fix this?
Error: The primary and alpha texture are not the same size for 'C:\Program Files (x86)\Auran\TRS2006/local/content augspqa8764/mesh_body/grate-grate_alpha.texture.txt'
Agree better fixed, then archive if you want to get rid of it
Use this site search: site:youtube.com Making an alpha channel using GIMP
HOWEVER, Chances are, you just need to check the Primary is a power of 2 in height and width, then resize the BMP (presumed) of the alpha to that in Paint.
See This Wikbook page:
Fixing Asset Errors which I've been evolving this past six months fixing about a 1,200+ errors. The first example resolution will leave thumbs in CM looking like crap, but is a good and dirty method to get on with.
Unlike Config.txt using a hack-hack at a begin line ('//') works fine in a texure.txt file, so you can just comment them out and experiment. Then restore. Don't know what your interest is, but running PEVtools images2tga NEVER hurts, and often does much good. If in TRS2006, you must install the batch file (copy from ..\bin...\tools\openwith eg: D:\Auran\TRS2009-SP4
\bin\CMPData\tools\OpenWith is one of my paths) in your editing folder and then drag and drop. PEV's tools won't install directly into TRS2006 like they autoinstall in newer versions. PM me if that's your case. Otherwise, just copy them up frm one of those newer versions folders. (I have copies in all my \editing folders--drag and drop! Fast!)
Bookmark that, and learn to site search and site search this thread in particular:
http://forums.auran.com/trainz/showthread.php?56002-Listing-of-Errors-and-How-to-Fix-Them
IrfanView vice GIMP is easier to use in a simple resizing an can convert back and forth to any formats we use... and is far easier to master. The thumbnails feature and renaming and file moving alone make it a great addition to a Trainz toolbox.
Good luck. // Frank