fix reusable prompt example

Author: m-y-mo

main.py

@@ -414,6 +414,7 @@ async def on_handoff_hook(
 
         taskflow = available_tools.taskflows.get(t)
         if taskflow is None:
+            await render_model_output(f"** 🤖❗ Input Error: No such taskflow: {t}. Available taskflows are: {'\n' + '\n'.join(available_tools.taskflows.keys())}")
             raise ValueError(f"No such taskflow: {t}")
 
         await render_model_output(f"** 🤖💪 Running Task Flow: {t}\n")

taskflows/examples/example_reusable_prompt.yaml

@@ -10,4 +10,4 @@ taskflow:
       user_prompt: |
         Tell me more about apples.
         
-        {{ GitHubSecurityLab/seclab-taskflow-agent/prompts/examples/example_prompt.yaml }}
+        {{ PROMPTS_GitHubSecurityLab/seclab-taskflow-agent/prompts/examples/example_prompt }}