Cant go back in the modpack

[PotatoOfTheCunnington]

As i try to log in the modpack, i reset it because it wasnt functioning properly. But once i click play it tells me, " Error installing the following pack: Attack of the B-Team. An error occurred while tempting to delete CodeChickenLib-universal-1.6.4-1.0.0.62.jar from the cache. Please check your system settings. This upsets me because I'd always reset the pack when there was a problem and it would work perfectly. I would just place my saves somewhere in my desktop so it wont resets the progess I made. Please help

[Munaus]

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