无法安装应用程序（错误代码：-505）

I have 2 applications with the different package name and different keystore, uploaded in play store. Unable to install both applications in a single phone, if i install both in different phones it works fine. If i try to install both applications in same phone, the first application will install without problem and works fine, but second application shows Can't install app (Error code: -505).I have 2 applications with the different packag