Failure to sign the Game

I want to build&run my unity project on android device. I created keystore. No problem in this regard. But When I click build&run button , I have this error.

 Error building Player: CommandInvokationFailure: Failed to build apk. See the Console for details. C:\Program Files\Java\jdk1.8.0_05\bin\java.exe -Xmx1024M -Dcom.android.sdkmanager.toolsdir="C:/Users/SenemY/Desktop/adt-bundle-windows-x86-20140321/adt-bundle-windows-x86-20140321/sdk\tools" -Dfile.encoding=UTF8 -jar "C:/Unity/Editor/Data/BuildTargetTools/AndroidPlayer\sdktools.jar" -

How to solve this problem?