When following the quickstart tutorial, there is a bug in the init.py where the variable for 'agent' needs to be 'root_agent' to match the agent.py file. This has been noted in the adk-python issues, ...
2021-12-22 08:31:08.474 5969-5969/ai.deepar.deepar_example E/AndroidRuntime: FATAL EXCEPTION: main Process: ai.deepar.deepar_example, PID: 5969 java.lang.IllegalStateException: Unable to update ...