Error loading ASGI app. Attribute "app" not found in module "main".

First Check

• I added a very descriptive title to this issue.
• I used the GitHub search to find a similar issue and didn’t find it.
• I searched the FastAPI documentation, with the integrated search.
• I already searched in Google “How to X in FastAPI” and didn’t find any information.
• I already read and followed all the tutorial in the docs and didn’t find an answer.
• I already checked if it is not related to FastAPI but to Pydantic.
• I already checked if it is not related to FastAPI but to Swagger UI.
• I already checked if it is not related to FastAPI but to ReDoc.

Commit to Help

• I commit to help with one of those options 👆

Example Code

from fastapi import FastAPI

app = FastAPI()


@app.get("/")
def read_root():
    return {"Hello": "World"}

Description

I was trying th basic code given on fastapi to verify my FASTAPI installation. I tried to execute above code with following command ‘uvicorn main:app --reload’ but got the bellow error

INFO: Will watch for changes in these directories: [‘D:\FASTAPI’] INFO: Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit) INFO: Started reloader process [7900] using watchgod ERROR: Error loading ASGI app. Attribute “app” not found in module “main”.

Operating System

Windows

Operating System Details

windows 10

FastAPI Version

0.70.0

Python Version

3.9.6

Additional Context

No response

[akitibala]

hi @sudoalger , please use uvicorn src.main:app instead of uvicorn src.main::app

[oligond]

I didn’t include extra code to keep the example clean.

That’s a good intention, but in your case (as I see it), the crucial parts people have to see in order to give useful advice how to solve your problem are missing.

Again, this looks like a problem of code organisation (how to avoid the circular import). Actually, I think you can build in the example from the fastapi-socketio docs: Just move the declaration of the socket handlers into a separate module and mount the socket manager in your app in main.py.

So

• please create a new issue (and link there from here)
• add the code portion to your example which is creating and mounting the socketio server to your app

and I’m pretty sure you will get the advice you need in no time