RuntimeError: Cannot add middleware after an application has started

[chisschima-one]

Hi guys,
While installing stable diffusion I encountered some errors and after copying and pasting the http://127.0.0.1:7860 link on the browser it didn't open.
Hrere is the error:
Traceback (most recent call last):
File "C:\Users\chiak\Documents\stable-diffusion\stable-diffusion-webui\launch.py", line 361, in
start()
File "C:\Users\chiak\Documents\stable-diffusion\stable-diffusion-webui\launch.py", line 356, in start
webui.webui()
File "C:\Users\chiak\Documents\stable-diffusion\stable-diffusion-webui\webui.py", line 232, in webui
app.add_middleware(GZipMiddleware, minimum_size=1000)
File "C:\Users\chiak\Documents\stable-diffusion\stable-diffusion-webui\venv\lib\site-packages\starlette\applications.py", line 135, in add_middleware
raise RuntimeError("Cannot add middleware after an application has started")
RuntimeError: Cannot add middleware after an application has started

Please any help I will really appreciate it. thanks
*I installed it on my drive C:*

[ClashSAN]

#7714 known issue.
if you're familiar with commandline, you can fix it right away by downgrading fastapi to 0.90.1
as new installations are currently grabbing 0.91.0 which is incompatible and prevents webui from loading.

[ClashSAN]

@Maranpani use "command prompt", not "powershell"
you should see a (venv) after entering

[chisschima-one]

Hi ClashSAN,
I was able to get it running thanks a lot bro ,🙏🙏👍🏽

[HalfHydra]

Hi, I did exactly this,, tried versions 0.89.1, 0.90.0, and 0.90.1 but none of them work. It ends up giving me a different error: ValueError: File cannot be fetched: C:/Users/<User>/Documents/. All files must contained within the Gradio python app working directory, or be a temp file created by the Gradio python app.

ERROR:    Exception in ASGI application
Traceback (most recent call last):
  File "C:\Users\<User>\Documents\StableDiffusion\stable-diffusion-webui\venv\lib\site-packages\uvicorn\protocols\http\h11_impl.py", line 407, in run_asgi
    result = await app(  # type: ignore[func-returns-value]
  File "C:\Users\<User>\Documents\StableDiffusion\stable-diffusion-webui\venv\lib\site-packages\uvicorn\middleware\proxy_headers.py", line 78, in __call__
    return await self.app(scope, receive, send)
  File "C:\Users\<User>\Documents\StableDiffusion\stable-diffusion-webui\venv\lib\site-packages\fastapi\applications.py", line 271, in __call__
    await super().__call__(scope, receive, send)
  File "C:\Users\<User>\Documents\StableDiffusion\stable-diffusion-webui\venv\lib\site-packages\starlette\applications.py", line 124, in __call__
    await self.middleware_stack(scope, receive, send)
  File "C:\Users\<User>\Documents\StableDiffusion\stable-diffusion-webui\venv\lib\site-packages\starlette\middleware\errors.py", line 184, in __call__
    raise exc
  File "C:\Users\<User>\Documents\StableDiffusion\stable-diffusion-webui\venv\lib\site-packages\starlette\middleware\errors.py", line 162, in __call__
    await self.app(scope, receive, _send)
  File "C:\Users\<User>\Documents\StableDiffusion\stable-diffusion-webui\venv\lib\site-packages\starlette\middleware\gzip.py", line 24, in __call__
    await responder(scope, receive, send)
  File "C:\Users\<User>\Documents\StableDiffusion\stable-diffusion-webui\venv\lib\site-packages\starlette\middleware\gzip.py", line 44, in __call__
    await self.app(scope, receive, self.send_with_gzip)
  File "C:\Users\<User>\Documents\StableDiffusion\stable-diffusion-webui\venv\lib\site-packages\starlette\middleware\exceptions.py", line 79, in __call__
    raise exc
  File "C:\Users\<User>\Documents\StableDiffusion\stable-diffusion-webui\venv\lib\site-packages\starlette\middleware\exceptions.py", line 68, in __call__
    await self.app(scope, receive, sender)
  File "C:\Users\<User>\Documents\StableDiffusion\stable-diffusion-webui\venv\lib\site-packages\fastapi\middleware\asyncexitstack.py", line 21, in __call__
    raise e
  File "C:\Users\<User>\Documents\StableDiffusion\stable-diffusion-webui\venv\lib\site-packages\fastapi\middleware\asyncexitstack.py", line 18, in __call__
    await self.app(scope, receive, send)
  File "C:\Users\<User>\Documents\StableDiffusion\stable-diffusion-webui\venv\lib\site-packages\starlette\routing.py", line 706, in __call__
    await route.handle(scope, receive, send)
  File "C:\Users\<User>\Documents\StableDiffusion\stable-diffusion-webui\venv\lib\site-packages\starlette\routing.py", line 276, in handle
    await self.app(scope, receive, send)
  File "C:\Users\<User>\Documents\StableDiffusion\stable-diffusion-webui\venv\lib\site-packages\starlette\routing.py", line 66, in app
    response = await func(request)
  File "C:\Users\<User>\Documents\StableDiffusion\stable-diffusion-webui\venv\lib\site-packages\fastapi\routing.py", line 237, in app
    raw_response = await run_endpoint_function(
  File "C:\Users\<User>\Documents\StableDiffusion\stable-diffusion-webui\venv\lib\site-packages\fastapi\routing.py", line 163, in run_endpoint_function
    return await dependant.call(**values)
  File "C:\Users\<User>\Documents\StableDiffusion\stable-diffusion-webui\venv\lib\site-packages\gradio\routes.py", line 286, in file
    raise ValueError(
ValueError: File cannot be fetched: C:/Users/<User>/Documents/. All files must contained within the Gradio python app working directory, or be a temp file created by the Gradio python app.

[Maranpani]

I don't have stable diffusion in users/Documents :-(

[ClashSAN]

@HalfHydra @Maranpani #7717 fixed, update/reinstall if still needed

[Maranpani]

Is someone could help me to installstble diffusion on Windows 10. Step by step to fix the error ?

I took the 7Giga version. I never had ".bat" writed but i undestsand it's the command files. CLicking on it had no effect.

I have this like other people :

To create a public link, set share=True in launch().
Traceback (most recent call last):
File "C:\STABLE DIFFUSION\stable-diffusion-webui\launch.py", line 361, in
start()
File "C:\STABLE DIFFUSION\stable-diffusion-webui\launch.py", line 356, in start
webui.webui()
File "C:\STABLE DIFFUSION\stable-diffusion-webui\webui.py", line 232, in webui
app.add_middleware(GZipMiddleware, minimum_size=1000)
File "C:\STABLE DIFFUSION\stable-diffusion-webui\venv\lib\site-packages\starlette\applications.py", line 135, in add_middleware
raise RuntimeError("Cannot add middleware after an application has started")
RuntimeError: Cannot add middleware after an application has started
Appuyez sur une touche pour continuer...

[ghost]

It worked for me. For the windows zipped release with embedded python: Go into sd.webui\system\python open a command prompt and type --> python -m pip install fastapi==0.90.1

[chisschima-one]

Hi ClashSAN,
I was to get it running thanks a lot bro ,🙏🙏👍🏽

[Jonseed]

Sometimes when I start the webui it upgrades fastapi to 0.94.0, which doesn't work. Why does the requirements_versions.txt file still install fastapi 0.94.0 if it is nonfunctional?

[firilexu]

!-----------------Possible Solution------------------------------!
1.Delete folders: fastapi and fastapi-0.....dist-info.
2.OpenCMD in your [...SD-root_folder.../venv/Lib/site-packages] by typing cmd in that folder address bar.
3.Type: pip install fastapi==0.90.1
4. If folders fastapi and fastapi-0.90.1.dist-info. are not there, they are being installed in Appdata folder.
5. In that case type: pip install --target=(...path\to\your\SD\installation...)\stable-diffusion-webui-master\venv\Lib\site-packages fastapi==0.90.1
6.change the requirements_versions.txt and requirements.txt in dreambooth folder (fastapi 0.x.x. with fastapi 0.90.1)

[3dcinetv]

File "E:\AI_Anime_SD2\webui\webui.py", line 224, in webui
app.add_middleware(GZipMiddleware, minimum_size=1000)
File "E:\AI_Anime_SD2\webui\venv\lib\site-packages\starlette\applications.py", line 139, in add_middleware
raise RuntimeError("Cannot add middleware after an application has started")
RuntimeError: Cannot add middleware after an application has started
Press any key to continue . . .

I cannot pass this line command even with all the changes you mention.

[dischordo]

You might have "set REQS_FILE=.\extensions\sd_dreambooth_extension\requirements.txt" in your webui-user.

Dreambooth's requirements probably have fastapi~=0.94.

If so, go to venv\Lib\site-packages and delete every fast api and starlette folder.

Change Dreambooths requirements in sd_dreambooth_extension to fastapi==0.90.1,

then go to venv\Scripts, type cmd in the bar, type
activate
you should have (venv) mode
then
pip install --upgrade fastapi==0.90.1
then
deactivate
Should be fixed.

[Alabasteropus]

Thank you! You are the hero we need, not the hero we deserve.

[meinbeitrag]

You might have "set REQS_FILE=.\extensions\sd_dreambooth_extension\requirements.txt" in your webui-user.

Dreambooth's requirements probably have fastapi~=0.94.

If so, go to venv\Lib\site-packages and delete every fast api and starlette folder.

Change Dreambooths requirements in sd_dreambooth_extension to fastapi==0.90.1,

then go to venv\Scripts, type cmd in the bar, type activate you should have (venv) mode then pip install --upgrade fastapi==0.90.1 then deactivate Should be fixed.

After 2 hours of trying you gave me the solution. Thank you!

[FilipeF12]

When I try this:

(venv) C:\Users\Bob\stable-diffusion-webui-master\venv\Scripts>pip install --upgrade fastapi==0.90.1

WARNING: Ignoring invalid distribution -rotobuf (c:\users\Bob\stable-diffusion-webui-master\venv\lib\site-packages)
WARNING: pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
WARNING: Ignoring invalid distribution -rotobuf (c:\users\Bob\stable-diffusion-webui-master\venv\lib\site-packages)
WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /simple/fastapi/
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /simple/fastapi/
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /simple/fastapi/
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /simple/fastapi/
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /simple/fastapi/
Could not fetch URL https://pypi.org/simple/fastapi/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/fastapi/ (Caused by SSLError("Can't connect to HTTPS URL because the SSL module is not available.")) - skipping
ERROR: Could not find a version that satisfies the requirement fastapi==0.90.1 (from versions: none)
ERROR: No matching distribution found for fastapi==0.90.1
WARNING: Ignoring invalid distribution -rotobuf (c:\users\Bob\stable-diffusion-webui-master\venv\lib\site-packages)
WARNING: Ignoring invalid distribution -rotobuf (c:\users\Bob\stable-diffusion-webui-master\venv\lib\site-packages)
WARNING: pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
Could not fetch URL https://pypi.org/simple/pip/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/pip/ (Caused by SSLError("Can't connect to HTTPS URL because the SSL module is not available.")) - skipping

[janwilmans]

If I just try to start again, it works most of the time, looks like its a startup race-condition. It seems to work more often if I keep the console focussed during startup. Once it has started, its fine.

[subcreation]

After entering "venv\scripts\activate" I get the following error:
venv\scripts\activate.bat : The module 'venv' could not be loaded. For more information, run 'Import-Module venv'.
At line:1 char:1

• venv\scripts\activate.bat

•   + CategoryInfo          : ObjectNotFound: (venv\scripts\activate.bat:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CouldNotAutoLoadModule
  
  

Then I ran and followed the instructions for Import-Modulevenv but this results in another attempt to run the webui that fails with "RuntimeError: Cannot add middleware after an application has started" again.

Then if I go ahead and enter "pip uninstall fastapi" anyway, I get "WARNING: Skipping fastapi as it is not installed."

Then I entered "pip install fastapi==0.90.1" and it appears to install, but when I attempt run again, I again get "RuntimeError: Cannot add middleware after an application has started"

[emotionaldreams]

same issue "RuntimeError: Cannot add middleware after an application has started". almost a year later and still no answer.