[Python] creating POST in python, getting error " Exception: not enough values to unpack...

Given this code

def run_chat_api(chat, chat_history):
url = f"{BASE_URL}/wca/core/chat/text/generation"
chat_history_str = json.dumps(chat_history)
#chat_history = get_chat_history("chat_history.json")


print("printing chat history")
print(chat_history)

print("printing URL")
print(url)

print("printing headers")
print(headers)



payload = {
"message_payload": {
"messages": [{"content": chat, "role": "USER"}],
}
}

files = []

files.append (payload)

#encoded_content = base64.b64encode(chat_history_str.read()).decode('utf-8')
files.append(('files', ("chat_history.json", chat_history_str, 'text/plain')))


for element in files:
print(element, end=" ")


try:
response = requests.post(
url=url,
headers=headers,
files=files,
timeout=180
)

if not response.ok:
handle_error(response=response.content, url=url, request_id={REQUEST_ID})
return response.json()
except Exception as e:
print("Exception: ")
return print(e)


Here is the printout:

printing chat history
[{'chat': 'write java to print "Hello WCA"', 'response': None}]
printing URL
https://api.dataplatform.cloud.ibm.com/v2/wca/core/chat/text/generation
printing headers
{'Content-Type': 'content-type: multipart/form-data', 'Authorization': 'Bearer 123456', 'Request-Id': 'request id: 6lubq6c3-6uee-90o1-oad730hnnvit'}
{'message_payload': {'messages': [{'content': 'write java to print "Hello WCA"', 'role': 'USER'}]}} ('files', ('chat_history.json', '[{"chat": "write java to print \\"Hello WCA\\"", "response": null}]', 'text/plain')) **Exception:
not enough values to unpack (expected 2, got 1)**


What does this exception refer to?

Rest of calling code:

def main():
st.title("WCA@IBM API Interactive Chat")
# Load chat history
chat_history = get_chat_history("/Users/kameronacole/PycharmProjects/WCAUseCase1/chat_history.json")
#chat_history = get_chat_history("chat_history.json")
# Create a text input for user chats
user_chat = st.text_area("Enter your chat:")
# Submit button
if st.button("Submit"):
if user_chat:
# Append the new chat to the history
chat_history.append({"chat": user_chat, "response": None})
save_chat_history("chat_history.json", chat_history)
# Run the chat API
response = run_chat_api(user_chat, chat_history)
# Display the response
if 'response' in response:
st.write(f"Response: {response['response']}")
else:
st.write("No response received from the API.")
# Update the response for the latest chat entry
if chat_history and 'response' in response:
chat_history[-1]['response'] = response['response']
# Add the chat and response to the history
for entry in chat_history:
st.write(f"Chat: {entry['chat']}\nResponse: {entry['response']}\n\n")
# Set the BEARER_TOKEN in the session state
if "BEARER_TOKEN" not in st.session_state:
st.session_state.BEARER_TOKEN = BEARER_TOKEN


if name == "main": main()

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