welcome/greet message gr.Chatbot isnot working

[hassanbsee2071]

Describe the bug

Hi Team,

I used below code to add welcome message.

from fastapi import FastAPI
import gradio as gr
import os
from dotenv import load_dotenv
from openai import OpenAI
import os
import requests
import json
from typing import List
from dotenv import load_dotenv
from bs4 import BeautifulSoup
from IPython.display import Markdown, display, update_display
from openai import OpenAI
from kubernetes import client, config
from fastapi import FastAPI
import gradio as gr


CUSTOM_PATH = "/gradio"

app = FastAPI()

@app.get("/")
def read_main():

def greet(name, history):
    return "Hello " + name + "!"

io = gr.ChatInterface(fn=greet, type="messages", chatbot=gr.Chatbot(value=[(None, "Welcome 👋. I am an assistant")],),)

app = gr.mount_gradio_app(app, io, path=CUSTOM_PATH)

Above code is not working. On the UI there is no error and continuously loading and loading. I opened console logs in the browser and I saw below error.

Uncaught (in promise) TypeError: right-hand side of 'in' should be an object, got undefined

I tried with same code here
https://stackoverflow.com/questions/76416674/welcome-message-in-python-chatbot-using-gradio-and-openai-api
and here
#7925

but still getting the same result.

Have you searched existing issues? 🔎

• I have searched and found no existing issues

Reproduction

import gradio as gr
def greet(name, history):
    return "Hello " + name + "!"

gr.ChatInterface(fn=greet, type="messages", chatbot=gr.Chatbot(value=[(None, "Welcome 👋. I am an assistant")],),)

Screenshot

No response

Logs

System Info

Package                                  Version
---------------------------------------- ---------------
accelerate                               1.4.0
aiofiles                                 23.2.1
aiohappyeyeballs                         2.4.8
aiohttp                                  3.11.13
aiohttp-retry                            2.9.1
aiosignal                                1.3.2
annotated-types                          0.7.0
anthropic                                0.49.0
anyio                                    4.8.0
asgiref                                  3.8.1
asttokens                                3.0.0
attrs                                    25.1.0
backoff                                  2.2.1
bcrypt                                   4.3.0
beautifulsoup4                           4.13.3
bitsandbytes                             0.42.0
build                                    1.2.2.post1
cachetools                               5.5.2
certifi                                  2025.1.31
charset-normalizer                       3.4.1
chroma-hnswlib                           0.7.6
chromadb                                 0.6.3
click                                    8.1.8
coloredlogs                              15.0.1
dataclasses-json                         0.6.7
datasets                                 3.3.2
decorator                                5.2.1
Deprecated                               1.2.18
dill                                     0.3.8
distro                                   1.9.0
durationpy                               0.9
executing                                2.2.0
faiss-cpu                                1.10.0
fastapi                                  0.115.11
feedparser                               6.0.11
ffmpy                                    0.5.0
filelock                                 3.17.0
flatbuffers                              25.2.10
frozenlist                               1.5.0
fsspec                                   2024.12.0
gensim                                   4.3.3
google-ai-generativelanguage             0.6.15
google-api-core                          2.24.1
google-api-python-client                 2.162.0
google-auth                              2.38.0
google-auth-httplib2                     0.2.0
google-generativeai                      0.8.4
googleapis-common-protos                 1.69.0
gradio                                   5.20.0
gradio_client                            1.7.2
groovy                                   0.1.2
grpcio                                   1.70.0
grpcio-status                            1.70.0
grpclib                                  0.4.7
h11                                      0.14.0
h2                                       4.2.0
hpack                                    4.1.0
httpcore                                 1.0.7
httplib2                                 0.22.0
httptools                                0.6.4
httpx                                    0.28.1
httpx-sse                                0.4.0
huggingface-hub                          0.29.2
humanfriendly                            10.0
hyperframe                               6.1.0
idna                                     3.10
importlib_metadata                       8.5.0
importlib_resources                      6.5.2
ipython                                  9.0.1
ipython_pygments_lexers                  1.1.1
jedi                                     0.19.2
Jinja2                                   3.1.5
jiter                                    0.8.2
joblib                                   1.4.2
jsonpatch                                1.33
jsonpointer                              3.0.0
kubernetes                               32.0.1
langchain                                0.3.20
langchain-chroma                         0.2.2
langchain-community                      0.3.19
langchain-core                           0.3.41
langchain-openai                         0.3.7
langchain-text-splitters                 0.3.6
langsmith                                0.3.11
markdown-it-py                           3.0.0
MarkupSafe                               2.1.5
marshmallow                              3.26.1
matplotlib-inline                        0.1.7
mdurl                                    0.1.2
mmh3                                     5.1.0
modal                                    0.73.87
monotonic                                1.6
mpmath                                   1.3.0
multidict                                6.1.0
multiprocess                             0.70.16
mypy-extensions                          1.0.0
narwhals                                 1.29.0
networkx                                 3.4.2
numpy                                    1.26.4
oauthlib                                 3.2.2
ollama                                   0.4.7
onnxruntime                              1.20.1
openai                                   1.65.3
opentelemetry-api                        1.30.0
opentelemetry-exporter-otlp-proto-common 1.30.0
opentelemetry-exporter-otlp-proto-grpc   1.30.0
opentelemetry-instrumentation            0.51b0
opentelemetry-instrumentation-asgi       0.51b0
opentelemetry-instrumentation-fastapi    0.51b0
opentelemetry-proto                      1.30.0
opentelemetry-sdk                        1.30.0
opentelemetry-semantic-conventions       0.51b0
opentelemetry-util-http                  0.51b0
orjson                                   3.10.15
overrides                                7.7.0
packaging                                24.2
pandas                                   2.2.3
parso                                    0.8.4
pexpect                                  4.9.0
pillow                                   11.1.0
pip                                      24.2
plotly                                   6.0.0
posthog                                  3.18.1
prompt_toolkit                           3.0.50
propcache                                0.3.0
proto-plus                               1.26.0
protobuf                                 5.29.3
psutil                                   7.0.0
ptyprocess                               0.7.0
pure_eval                                0.2.3
pyarrow                                  19.0.1
pyasn1                                   0.6.1
pyasn1_modules                           0.4.1
pydantic                                 2.10.6
pydantic_core                            2.27.2
pydantic-settings                        2.8.1
pydub                                    0.25.1
Pygments                                 2.19.1
PyJWT                                    2.10.1
pyparsing                                3.2.1
PyPika                                   0.48.9
pyproject_hooks                          1.2.0
python-dateutil                          2.9.0.post0
python-dotenv                            1.0.1
python-multipart                         0.0.20
pytz                                     2025.1
PyYAML                                   6.0.2
regex                                    2024.11.6
requests                                 2.32.3
requests-oauthlib                        2.0.0
requests-toolbelt                        1.0.0
rich                                     13.9.4
rsa                                      4.9
ruff                                     0.9.9
safehttpx                                0.1.6
safetensors                              0.5.3
scikit-learn                             1.6.1
scipy                                    1.13.1
semantic-version                         2.10.0
sentence-transformers                    3.4.1
setuptools                               75.8.2
sgmllib3k                                1.0.0
shellingham                              1.5.4
sigtools                                 4.0.1
six                                      1.17.0
smart-open                               7.1.0
sniffio                                  1.3.1
soupsieve                                2.6
speedtest-cli                            2.1.3
SQLAlchemy                               2.0.38
stack-data                               0.6.3
starlette                                0.46.0
sympy                                    1.13.1
synchronicity                            0.9.11
tenacity                                 9.0.0
threadpoolctl                            3.5.0
tiktoken                                 0.9.0
tokenizers                               0.21.0
toml                                     0.10.2
tomlkit                                  0.13.2
torch                                    2.6.0
tqdm                                     4.67.1
traitlets                                5.14.3
transformers                             4.49.0
twilio                                   9.4.6
typer                                    0.15.2
types-certifi                            2021.10.8.3
types-toml                               0.10.8.20240310
typing_extensions                        4.12.2
typing-inspect                           0.9.0
tzdata                                   2025.1
uritemplate                              4.1.1
urllib3                                  2.3.0
uvicorn                                  0.34.0
uvloop                                   0.21.0
watchfiles                               1.0.4
wcwidth                                  0.2.13
websocket-client                         1.8.0
websockets                               15.0
wrapt                                    1.17.2
xxhash                                   3.5.0
yarl                                     1.18.3
zipp                                     3.21.0
zstandard                                0.23.0

Severity

Blocking usage of gradio

[abidlabs]

Hi @hassanbsee2071 you are mixing up the format of the messages. You have specified type="messages" but you are supplying the Chatbot value as "tuples". Please see the chatbot docs:

• https://www.gradio.app/docs/gradio/chatbot#param-chatbot-type

You might also find a placeholder useful:

• https://www.gradio.app/docs/gradio/chatbot#param-chatbot-placeholder