NDK build fails

To develop native app

as explained here
I build the NDK.
But finally, I get the following failure error:

Summary: 1 task failed:
/home/xxx/build-webos/meta-qt6/recipes-qt/qt6/qtbase_git.bb:do_install_ptest_base

and
build-webos/BUILD/deploy/
The folder is empty.

What should I do to make the build successful?