I downloaded a texture pack and it crashes my game but I do not know how I can delete it on minecraft self get.zou you can please help me thank you for reading it

Put the summary of the bug you're having here
bmg: Unable to fit: minecraft:blocks/wool_colored_gray - size: 256x256 - Maybe try a lowerresolution resourcepack?
at bmf.c(SourceFile:60)
at bmh.b(SourceFile:197)
at bmh.a(SourceFile:77)
at bot.j(SourceFile:553)
at bot.a(SourceFile:139)
at bou.a(SourceFile:23)
at bnn.a(SourceFile:99)
at ave.am(SourceFile:448)
at ave.a(SourceFile:310)
at net.minecraft.client.main.Main.main(SourceFile:124)

A detailed walkthrough of the error, its code path and all known details is as follows:
*What I expected to happen was..:*my game start up en i can play minecraft with my new texture pack
Describe what you thought should happen here

*What actually happened was...:*my game not wont to start up en i get a crach report
Describe what happened here

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...first it legd
3. ...i closed my game en it wont start up