How to force stop a app on bluestacks?

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Not Working....I try and download the cache application and it does the same because I have blue stacks, How do I fix it saying "Error retrieving information from server [RPC:S-7:AEC-0]. What does ...   more
... your computer system before installing Bluestacks or if you already have ...   more
it also hapeens to me when i install an app it says application failiure and i unstall it and reinstall then also it says says same message what i do????   more
This usually happens because of a file system error or corrupted cache system. Please clean the system with a cache leaning application that you can find on the market. If you have not seen the ...   more

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