Error on android game building, Win32Exception: ApplicationName='F:/Android SDK\tools\zipalign.exe', CommandLine='4

Hi at all, I'm trying to develop my first game(in 2D) and when I try to build the game for android, after I've selected the android SDK Unity give me an error, that for me it's indecipherable. Error: Error building Player: Win32Exception: ApplicationName='F:/Android SDK\tools\zipalign.exe', CommandLine='4 "F:\Dani\Unity\CrazyCyclist\Temp/StagingArea/Package_unaligned.apk" "F:\Dani\Unity\CrazyCyclist\Temp/StagingArea/Package.apk"', CurrentDirectory='Temp/StagingArea' I've tryed to copy the apk in Temp/StagingArea/Package_unaligned.apk and I've installed it on my android phone and it works great but somewhere there must be a problem. Can you help me? :P Thank you in advance! Soon