Qt Creator cannot sign android apk

When I try to sign my apk with qtcreator, by filling Sign package area, the deploy goes to failure.

See the error:

-release-nosign:
[echo] No key.store and key.alias properties found in build.properties.
[echo] Please sign /home/denis/Cpp/MultimediaPetTouch/MultimediaPetTouch-build-Android/android-build/bin/QtApp-release-unsigned.apk manually
[echo] and run zipalign from the Android SDK tools.
[propertyfile] Creating new property file: /home/denis/Cpp/MultimediaPetTouch/MultimediaPetTouch-build-Android/android-build/bin/build.prop
[propertyfile] Updating property file: /home/denis/Cpp/MultimediaPetTouch/MultimediaPetTouch-build-Android/android-build/bin/build.prop
[propertyfile] Updating property file: /home/denis/Cpp/MultimediaPetTouch/MultimediaPetTouch-build-Android/android-build/bin/build.prop
[propertyfile] Updating property file: /home/denis/Cpp/MultimediaPetTouch/MultimediaPetTouch-build-Android/android-build/bin/build.prop

-release-sign:

-post-build:

release:

BUILD SUCCESSFUL
Total time: 15 seconds
Signing Android package.
jar signed.

Warning:
No -tsa or -tsacert is provided and this jar is not timestamped. Without a timestamp, users may not be able to validate this jar after the signer certificate's expiration date (2042-01-12) or after any future revocation date.
11:02:50: The process "/Dati/Qt/Qt5.3.1/5.3/android_armv7/bin/androiddeployqt" exited with code 15.
Error while building/deploying project MultimediaPetTouch (kit: Android for armeabi-v7a (GCC 4.8, Qt 5.3.1))
When executing step 'Deploy to Android device'
11:02:50: Elapsed time: 00:21.