Error to compile

i'm trying to make a simple web viewer of my site but when i compile i always get the following error:

App Inventor is unable to compile this project.
The compiler error output was
________Preparing application icon
________Creating animation xml
________Creating style xml
________Creating provider_path xml
________Creating network_security_config xml
________Generating adaptive icon file
________Generating round adaptive icon file
________Generating adaptive icon background file
________Generating manifest file
________Attaching native libraries
________Attaching Android Archive (AAR) libraries
________Attaching component assets
________Invoking AAPT
AAPT time: 1.027 seconds
________Compiling source files
(compiling appinventor/ai_scudetto1980/Scudettomondiale/Screen1.yail to appinventor.ai_scudetto1980.Scudettomondiale.Screen1)
(compiling /tmp/runtime3579361509620861345.scm to
Kawa compile time: 1.833 seconds
________Invoking DX
DX time: 20.061000 seconds
________Invoking ApkBuilder
________ZipAligning the apk file
ZIPALIGN time: 0.072 seconds
________Signing the apk file
YAIL compiler - apksigner execution failed.

Did you change your keystore, if so make sure to use default values..

Default Keystore file name: android.keystore
Default Keystore Password: android
Default Keystore Alias: androidkey
Default Key Password: android