I executed the command you gave me.
C:\Users\stepi\Downloads\Mobile game>keytool -v -list -keystore mykeystore.keystore
Enter keystore password:
Keystore type: PKCS12
Keystore provider: SUN
Your keystore contains 1 entry
Alias name: myalias
Creation date: 10/13/2020
Entry type: PrivateKeyEntry
Certificate chain length: 1
We have created a keystore with the same parameters as the example in the manual.
keytool -genkey -v -noprompt -dname "CN=John Smith, OU=Area 51, O=US Air Force, L=Unknown, ST=Nevada, C=US" -keystore mykeystore.keystore -storepass 5Up3r_53cR3t -alias myAlias -keyalg RSA -validity 9125
The error occurred when bundling from the editor.Maybe you need JDK11?
The keytool is used from the Engine.