App is not installing on android 5.0

ionic-v1
1

I was initially building my project for android 4.4 but when I installed it on android 5.0 , it is not installing apk .

Error : App not installed

Device : Nexus 5

ionic info 
Your system information:

OS: Windows 8
Node Version: v0.10.26
Cordova CLI: 4.2.0
Ionic Version: 1.0.0-beta.14
Ionic CLI Version: 1.3.10
2

I check out new project and copied my files there, Now every thing working perfectly fine. Dont know cause of problem.