Invalid ESD in RR Route Check?

Can anyone advise me what the significance is of the following report from Route Riter when checking the West Somerset Railway route:-

wsr_gen_house_18.s Contains an invalid ESD of 257s
wsr_gen_house_26.s Contains an invalid ESD of 257s
wsr_gen_house_30.s Contains an invalid ESD of 257s
wsr_wd_cross.s Contains an invalid ESD of 257s

and what if anything I need to do?
I decided to install it as part of the WSR entry into the Route Directory.
Alec

Hi Alec.

You will find the ESD values in the .sd files for those shapes listed, If the route works OK don't worry about it, it is a valid ESD, so it will work if entered correctly.

If it shows up as an error in MSTS, check the .sd files and make sure it reads exactly like this............

ESD_Alternative_Texture ( 257 )

Mark
Thanks for the answer, and I'll have a further look this evening. I haven't actually run this route yet. I like to run the typical Route Riter checks, etc. before I do, and then set the route up as a Mini Route.
Alec