Agent Config : Sub Agents not working on Windows 11

[billyaungmyint]

Hi Everyone ,

I am on Windows 11 and trying out Agent Config feature but I am not able run adk web with sub agents.
The below code from root_agent.yaml from the examples given work only if the sub agents lines are commented.

Without commenting them , I will get the below error.
Any idea ?
TIA

"ValueError: No root_agent found for 'my_agent2'. Searched in 'my_agent2.agent.root_agent', 'my_agent2.root_agent' and 'my_agent2/root_agent.yaml'. Ensure 'D:<folder path>\my_agent2' is structured correctly, an .env file can be loaded if present, and a root_agent is exposed."

# yaml-language-server: $schema=https://raw.githubusercontent.com/google/adk-python/refs/heads/main/src/google/adk/agents/config_schemas/AgentConfig.json
name: root_agent
description: A helpful tutor for math and coding questions.
instruction: |
  follow these steps:
  1. If the user asks about programming or coding, delegate to the code_tutor_agent.
  2. If the user asks about math concepts or problems, delegate to the math_tutor_agent.
  3. If neither, respond that you can only help with coding or math questions.
# sub_agents:
#   - config_path: code_tutor_agent.yaml
#   - config_path: math_tutor_agent.yaml
model: gemini-2.5-flash

https://github.com/google/adk-python/tree/29968d44ae519c18b1e6aa25b6228d62fadba4c3/contributing/samples/multi_agent_basic_config