atalk-android: F-Droid build failed

"Install Android SDK Platform 31 (revision: 1)" complete.
"Install Android SDK Platform 31 (revision: 1)" finished.
Build-tool 31.0.0 is missing DX at /opt/android-sdk/build-tools/31.0.0/dx

FAILURE: Build failed with an exception.

* What went wrong:
Could not determine the dependencies of task ':aTalk:compileFdroidReleaseJavaWithJavac'.
> Installed Build Tools revision 31.0.0 is corrupted. Remove and install again using the SDK Manager.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 18s

Could you please take a look? Thanks!