Navaneeth

I was trying to play pixelmon using a modpack i made i had everything i needed downloaded but whenever i click play the instance either never loads or wehn it does it load with 0000000 is of text and comes with an error that i can't read cause the text is all 0s. Also when i close the error message and to try to make or load a world it just crashes i don't what i am doing wrong please help