Download the latest version of Traccar Client, I debug it and it works perfectly, then I run ffluter build apk and it generates the APK without problems but when installing it on the Android device, I get the error: "App not installed as package to be invalid".


If you have modified the original code, your app will certainly need to be signed.
You are right! Thanks a lot.
Download the latest version of Traccar Client, I debug it and it works perfectly, then I run ffluter build apk and it generates the APK without problems but when installing it on the Android device, I get the error: "App not installed as package to be invalid".