i need help, i downloaded a texture pack on my macbook, and now minecraft is crashing all the time

Please attach the crash report ([minecraft|http://hopper.minecraft.net/help/finding-minecraft-data-folder]/crash-reports/crash-<DATE>-client.txt), otherwise we can not diagnose this issue.
For technical support please use the Mojang Support Center.

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You need to attach the file (click "More" at the top of this page, select "Attach Files"), not paste the name of the file.