Google Play -505 ERROR

Hello, I have a Xamarin.Forms project and I use this project for different two applications. I modified existing project and I used it for another application. I uploaded these two apps to Google Play and I tried to download them to my device but I can't install them if one of them already exists in the device. I have the error in Google Play Store, a pop-up window appears and says that Unknown error code during application install: “-505”. I searched for the solution and my problem is probably
"Sometimes, the error 505 would happen if there were two or more apps both looking for similar permission, such as two banking apps. You can just uninstall one to solve the issue."
I need both app in my device.
How can I solve this issue, I could't find any solution. Thanks