Help ! Api version

I got stuck … I dont know why my app is not installing in my android ! showing this error ! if anyone have solution please tell me i dont want to lose my project . Mistakenly I just change the api version from screen 1 and after that my app can be tested online but when i try to install it shows this error.

Delete old instances from your device before installing the new APK

What does this mean? Did you change the version number in screen1 designer mode?

i.e. here?


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Go to Screen1 and set Min API to lower in properties.