I am trying to install Qt with android , but i am facing issues while adding AVD,

sdk location : D:\android-sdk
ndk location : D:\android\android-ndk-r15c-windows-x86_64\android-ndk-r15c
creator showing it found 10 tool chains for this ndk
ant location : D:\apache-ant-1.9.6\src\script\ant.bat

whenever i try to start avd manager i am getting a pop message like as below

AVD manager tool is not available in the installed SDK tools(version 26.0.2). use the command line tool "avdmanager" for advanced AVD management.

and if i try to bulid sample project i am getting error like as below

Error while building/deploying project test (kit: Android for x86 (GCC 4.9, Qt 5.9.0 for Android x86))
When executing step "Deploy to Android device"

if anyone knows what's wrong, kindly help me to solve this problem.
i am using Qt 5.9.0 with Qt creator 4.3.1
Thank you.