About Screen Title was empty in your project
Logcat
java.lang.RuntimeException: Unable to start activity ComponentInfo{io.kodular.Panzieri_ale.DEMO/io.kodular.Panzieri_ale.DEMO.Screen1}: /tmp/1632501986606_0.7559402701999748-0/youngandroidproject/../src/io/kodular/Panzieri_ale/DEMO/Screen1.yail:11:55: unbound location null
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3311)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3460)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2047)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:224)
at android.app.ActivityThread.main(ActivityThread.java:7590)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:539)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:950)
Caused by: /tmp/1632501986606_0.7559402701999748-0/youngandroidproject/../src/io/kodular/Panzieri_ale/DEMO/Screen1.yail:11:55: unbound location null
at gnu.mapping.Location.get(Location.java:67)
at io.kodular.Panzieri_ale.DEMO.Screen1.lambda3(Screen1.yail:11)
at io.kodular.Panzieri_ale.DEMO.Screen1$frame.apply0(Screen1.yail:523)
at gnu.expr.ModuleMethod.apply0(ModuleMethod.java:186)
at kawa.lang.Promise.force(Promise.java:27)
at kawa.lang.Promise.force(Promise.java:37)
at kawa.lib.misc.force(misc.scm:98)
at io.kodular.Panzieri_ale.DEMO.Screen1.$define(Screen1.yail:10307)
at com.google.appinventor.components.runtime.Form.onCreateFinish2(SourceFile:503)
at com.google.appinventor.components.runtime.Form.onCreateFinish(SourceFile:447)
at com.google.appinventor.components.runtime.Form.onCreate(SourceFile:377)
at android.app.Activity.performCreate(Activity.java:7893)
at android.app.Activity.performCreate(Activity.java:7880)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1307)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3286)
... 11 more