diff --git a/requirements.txt b/requirements.txt
index 420df298..dca3e347 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -93,9 +93,9 @@ tiktoken
 
 espnet==202301
 espnet_model_zoo==0.1.7
-flask==2.2.3
+# flask==2.2.3
 
-flask_cors==3.0.10
+# flask_cors==3.0.10
 waitress==2.1.2
 asteroid
 
diff --git a/swarms/agents/utils/AgentManager.py b/swarms/agents/utils/AgentManager.py
index 2e7b201c..ad2b50fd 100644
--- a/swarms/agents/utils/AgentManager.py
+++ b/swarms/agents/utils/AgentManager.py
@@ -13,7 +13,8 @@ from .AgentBuilder import AgentBuilder
 from .Calback import EVALCallbackHandler, ExecutionTracingCallbackHandler
 
 
-CallbackManager.set_handler(handler=EVALCallbackHandler())
+callback_manager_instance = CallbackManager()
+callback_manager_instance.set_handler(handler=EVALCallbackHandler())
 
 class AgentManager:
     def __init__(self, toolsets: list[BaseToolSet] = []):