App not installed ERROR

when I am trying to install my first niotron application it’s showing an error

**App not Installed**

I am using

Firebase DB / Auth / Core / Material Textbox

Tested Device Android Version 8

Settings;

Change your app package name.
Something like this - com.yourname.yourprojectname

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why you set to sdk 8.0 let it 11

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it’s not necessary
and this app must not be install on device because the device must be having a greater android version @SL_Cyber_Tech Please check your android version

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