Describe the Bug

(I am a beginner to Github)
An error occurs everytime I try to use Create Steam n Rails which states that the mod has failed to load correctly, I had to uninstall the addon to use Minecraft which is a shame because I really enjoyed using it.

It states that there is not enough Data available, I allocated 8G to Minecraft but still the error persists.
I have uninstalled the mod and the game runs without it but I want the mod to function, I normally use the 1.5.2 version where the "not enough data" error occurs.

crash log here: https://pastebin.com/3SY6Ekm7