Feed The Beast

I just downloaded the Sky Oddesy from the ftpapp thing then i clicked play to launch it up the minecraft launcher popped up then it showed ftb sky oddsy 1.12. Something forge then i click play it just showed black screen then crashed and said unexpected error Exit Code 0 but i checked it wasnt about ram or anything problems. Willit be related to the file locations cuz it was stored in like a random numbers and alphabets folder . I am using java 64bit offline latest version and i tried launching other vanilla versions in the ftb mc launcher it works just fine