Raise error when function as llm_config passed to GroupChatManager (#911)

* fix groupchat selection

* update

* update notbooks

* update

* update

Author: yiranwu0

autogen/agentchat/groupchat.py

@@ -286,6 +286,11 @@ def __init__(
         system_message: Optional[Union[str, List]] = "Group chat manager.",
         **kwargs,
     ):
+        if kwargs.get("llm_config") and (kwargs["llm_config"].get("functions") or kwargs["llm_config"].get("tools")):
+            raise ValueError(
+                "GroupChatManager is not allowed to make function/tool calls. Please remove the 'functions' or 'tools' config in 'llm_config' you passed in."
+            )
+
         super().__init__(
             name=name,
             max_consecutive_auto_reply=max_consecutive_auto_reply,

notebook/agentchat_groupchat_RAG.ipynb

@@ -292,7 +292,10 @@
     "        speaker_selection_method=\"random\",\n",
     "        allow_repeat_speaker=False,\n",
     "    )\n",
-    "    manager = autogen.GroupChatManager(groupchat=groupchat, llm_config=llm_config)\n",
+    "\n",
+    "    manager_llm_config = llm_config.copy()\n",
+    "    manager_llm_config.pop(\"functions\")\n",
+    "    manager = autogen.GroupChatManager(groupchat=groupchat, llm_config=manager_llm_config)\n",
     "\n",
     "    # Start chatting with the boss as this is the user proxy agent.\n",
     "    boss.initiate_chat(\n",

test/agentchat/test_function_call_groupchat.py

@@ -54,7 +54,18 @@ def get_random_number():
         llm_config=llm_config,
     )
     groupchat = autogen.GroupChat(agents=[user_proxy, coder], messages=[], max_round=7)
-    manager = autogen.GroupChatManager(groupchat=groupchat, llm_config=llm_config)
+
+    # pass in llm_config with functions
+    with pytest.raises(
+        ValueError,
+        match="GroupChatManager is not allowed to make function/tool calls. Please remove the 'functions' or 'tools' config in 'llm_config' you passed in.",
+    ):
+        manager = autogen.GroupChatManager(groupchat=groupchat, llm_config=llm_config)
+
+    # pass in llm_config without functions
+    llm_config_manager = llm_config.copy()
+    del llm_config_manager["functions"]
+    manager = autogen.GroupChatManager(groupchat=groupchat, llm_config=llm_config_manager)
 
     user_proxy.initiate_chat(manager, message="Let's start the game!")