New user needs help!

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Sorry for posting this in the general section, but I was told I can't post in the development section until I have 10 posts. I hope someone here can help me! I just finished downgrading my OS from the .29 build to .17 and everything went okay except for one big problem I am having. When I try to launch file manager I get "Unfortunately, File Manager has stopped". Everything else on my device works. Has anyone had any experience with this?

usually that occurs when you didn't clear cache etc...

For future reference, this type of thread shouldn't be posted in the development section anyway. Development is for people releasing ROMs, recoveries, kernels, and other related items for download.