Error in third party Library addition in qt android project

Question

I am trying to add and android library to my qt android project. But it fails while deploying. I followed steps as given in documentation : Third-party Android Libraries

I get the error

BUILD FAILED E:\Installations\ADT\adt-bundle-windows-x86-20131030\sdk\tools\ant\build.xml:577: ../android-build/libs/ resolve to a path with no project.properties file for project E:\WorkSpaces\Qt\Qt_WidgetApps\AndroidSerialPortTrials\ThirdPartyLib\build-ThirdPartyLib-Android_for_armeabi_v7a_GCC_4_8_Qt_5_3_0_Android_GCC_arm_4_8-Debug\android-build

my project.properties

android.library.reference.1=../android-build/libs/

projectPath/android/

• libs/
• AndroidManifest.xml
• project.properties

projectPath/android/libs/ - xx.so - yy.jar

I tried

android.library.reference.1=libs/ as given in documentation
android.library.reference.1=../android/libs/
android.library.reference.1=./libs/

But all gives error