The apk build for Unity3.3 can't run but it build for Unity3.1 is successful

Unity Engine
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1

Before , i use the unity3.1 to build the apk and the test is successful ,but today i use the unity3.3 because i want to choose the API Level ,however when i builded the project ,and install to the phone ,the apk can’t run . who can tell me why ,thanks:-|

2

Any error output you can quote?