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I am facing an application can not be installed error on my Samsaung Galaxy S Plus whenever I try to install applications. I have already allowed installation from unknown sources, but it didn't work. It still have a lot of memory space although my phone has no SD card.

Can you suggest some solutions to solve this? Thanks in advance.

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Have you already restarted your phone since you got this error? –  ndsmyter Jan 3 '13 at 9:17
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And what is the complete error message? Is there more to it than just "cannot", maybe some reason given? –  Izzy Jan 3 '13 at 10:09
    
If your locale and UI language on the phone is not set to english, change it to english and try again. –  yrajabi Jan 3 '13 at 10:27
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Did you see this? –  Sid Jan 3 '13 at 14:38
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2 Answers 2

First, make sure you have sufficient internal memory (that should be more than just the app size, because app needs to store data too). The storage for apps is different from internal mass storage. You can find it under Settings > Storage, look for the Applications label.

Also, if the app is, say 20 MB, keep at least 50 MB free, because apart from the app storage, Android also tends to slow down when short on internal memory.

If you're trying to update/overwrite an installed app, try removing it first. source.

If that didn't work, try this solution. It is aimed at Titanium Backup, but I guess it might work for other apps too.

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There might be mainly these two possibilities 1) either the device didn't have the sufficient memory 2) ADB Connection Time out error

To solve 1) clear you temporary memory, un install application or clear un wanted cache 2) go to preferences->Android->DDMS and increase you ADB connection time out according to your need mine is 11000

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