# Anki 2.33 Will Not Start **URL:** \ **Category:** Help\ **Created:** [August 31, 2020, 8:12pm UTC](https://forums.ankiweb.net/t/anki-2-33-will-not-start/2882 "2020-08-31T20:12:19Z")\ **Posts on this page:** 12\ **Page:** 1
**Author:** ![whome](https://avatars.discourse-cdn.com/v4/letter/w/41988e/32.png) [@whome](https://forums.ankiweb.net/u/whome)\ **Post date:** [August 31, 2020, 8:12pm UTC](https://forums.ankiweb.net/t/anki-2-33-will-not-start/2882/1 "2020-08-31T20:12:19Z")
I’m trying to run 2.33 and get this error message on the Anki Console Exception in thread Thread-1: Traceback (most recent call last): File “threading.py”, line 932, in \_bootstrap\_inner File “aqt\mediasrv.py”, line 63, in run File “waitress\server.py”, line 81, in create\_server File “waitress\server.py”, line 242, in **init** File “waitress\server.py”, line 254, in get\_server\_name ValueError: Requires an IP to get the server name mpv too old for key rebinding The last working version for me is 2.26 ---
**Author:** ![dae](https://sea2.discourse-cdn.com/flex002/user_avatar/forums.ankiweb.net/dae/32/65_2.png) [@dae](https://forums.ankiweb.net/u/dae)\ **Post date:** [August 31, 2020, 11:40pm UTC](https://forums.ankiweb.net/t/anki-2-33-will-not-start/2882/2 "2020-08-31T23:40:52Z")
What is your computer’s network hostname set to? @addons_zz any ideas? ---
**Author:** ![whome](https://avatars.discourse-cdn.com/v4/letter/w/41988e/32.png) [@whome](https://forums.ankiweb.net/u/whome)\ **Post date:** [September 1, 2020, 8:26pm UTC](https://forums.ankiweb.net/t/anki-2-33-will-not-start/2882/3 "2020-09-01T20:26:56Z")
Hostname: Desktop-7ZAAFP ---
**Author:** ![addons\_zz](https://sea2.discourse-cdn.com/flex002/user_avatar/forums.ankiweb.net/addons_zz/32/43_2.png) [@addons\_zz](https://forums.ankiweb.net/u/addons_zz)\ **Post date:** [September 2, 2020, 12:13am UTC](https://forums.ankiweb.net/t/anki-2-33-will-not-start/2882/4 "2020-09-02T00:13:51Z")
I opened an issue on [https://github.com/Pylons/waitress/issues/312](https://github.com/Pylons/waitress/issues/312) (ValueError: Requires an IP to get the server name) asking for help. @whome, what is your operating system? Linux? Can you run a Python Script to help debugging the problem? If you do not have Python installed, you can install it from [https://www.python.org/downloads/](https://www.python.org/downloads/) You would need to create a text file named **`test.py`** with the contents: ```python import os import flask from waitress.server import create_server app = flask.Flask( __name__ ) desired_port = int(os.getenv("ANKI_API_PORT", "0")) server = create_server(app, host="127.0.0.1", port=desired_port) print("Serving on http://%s:%s"% (server.effective_host, server.effective_port)) ``` After creating the **`test.py`** file, you can open a command line and run it with the command **`python test.py`** or **`python3 test.py`** After running the script, you should have an output like the following: ```auto Serving on http://:56008 ``` Or it could show you the same error: ```auto Traceback (most recent call last): File "test.py", line 8, in server = create_server(app, host="127.0.0.1", port=desired_port) File "waitress\server.py", line 81, in create_server last_serv = TcpWSGIServer( File "waitress\server.py", line 242, in __init__ self.server_name = self.get_server_name(None) File "waitress\server.py", line 254, in get_server_name raise ValueError("Requires an IP to get the server name") ValueError: Requires an IP to get the server name ``` ---
**Author:** ![whome](https://avatars.discourse-cdn.com/v4/letter/w/41988e/32.png) [@whome](https://forums.ankiweb.net/u/whome)\ **Post date:** [September 2, 2020, 12:31am UTC](https://forums.ankiweb.net/t/anki-2-33-will-not-start/2882/5 "2020-09-02T00:31:50Z")
Windows 10, I’m getting the following error with the Python script. ModuleNotFoundError: No module named ‘flask’ ---
**Author:** ![dae](https://sea2.discourse-cdn.com/flex002/user_avatar/forums.ankiweb.net/dae/32/65_2.png) [@dae](https://forums.ankiweb.net/u/dae)\ **Post date:** [September 2, 2020, 11:27am UTC](https://forums.ankiweb.net/t/anki-2-33-will-not-start/2882/6 "2020-09-02T11:27:19Z")
You’ll need to “pip install flask” first What’s the contents of your hosts file? > **[How to Edit Your Hosts File on Windows, Mac, or Linux](https://www.howtogeek.com/howto/27350/beginner-geek-how-to-edit-your-hosts-file/)** > > On occasion you will need to edit the hosts file on your machine. Sometimes because of an attack or prank, and others so that you can simply and freely control access to websites and network traffic. ---
**Author:** ![whome](https://avatars.discourse-cdn.com/v4/letter/w/41988e/32.png) [@whome](https://forums.ankiweb.net/u/whome)\ **Post date:** [September 2, 2020, 11:51am UTC](https://forums.ankiweb.net/t/anki-2-33-will-not-start/2882/7 "2020-09-02T11:51:54Z")
It is related to the Hostfile! With a Hostfile that says "127.0.0.1 " Traceback (most recent call last): File “…\test.py”, line 8, in server = create\_server(app, host=“127.0.0.1”, port=desired\_port) File “…\Python38-32\lib\site-packages\waitress\server.py”, line 81, in create\_server last\_serv = TcpWSGIServer( File “…\Python38-32\lib\site-packages\waitress\server.py”, line 242, in **init** self.server\_name = self.get\_server\_name(self.effective\_host) File “…\Python38-32\lib\site-packages\waitress\server.py”, line 254, in get\_server\_name raise ValueError(“Requires an IP to get the server name”) ValueError: Requires an IP to get the server name With a Blank hostfile Serving on http://DESKTOP-…:59385 With a Hostfile with a site blocked Serving on [site]:59786 It seems that Waitress may not be reading the hostfile properly. I wonder why it worked in 2.2.26? ---
**Author:** ![dae](https://sea2.discourse-cdn.com/flex002/user_avatar/forums.ankiweb.net/dae/32/65_2.png) [@dae](https://forums.ankiweb.net/u/dae)\ **Post date:** [September 2, 2020, 12:11pm UTC](https://forums.ankiweb.net/t/anki-2-33-will-not-start/2882/8 "2020-09-02T12:11:27Z")
To confirm, the hostname was missing - the line just said "127.0.0.1 " with nothing else on that line? That does not look valid - it should have have a hostname after it. ---
**Author:** ![whome](https://avatars.discourse-cdn.com/v4/letter/w/41988e/32.png) [@whome](https://forums.ankiweb.net/u/whome)\ **Post date:** [September 2, 2020, 12:18pm UTC](https://forums.ankiweb.net/t/anki-2-33-will-not-start/2882/9 "2020-09-02T12:18:52Z")
Yes, that one was missing the hostname. When it does have a hostname, it says Serving on Hostname:59786 . It seems that Waitress is doing the following 1. Read the Hosts file 2. Find the first entry that says 127.0.0.1 Hostname 3. Set Server to Hostname 4)Which fails if Hostame is either blank or a site. ---
**Author:** ![dae](https://sea2.discourse-cdn.com/flex002/user_avatar/forums.ankiweb.net/dae/32/65_2.png) [@dae](https://forums.ankiweb.net/u/dae)\ **Post date:** [September 3, 2020, 12:05am UTC](https://forums.ankiweb.net/t/anki-2-33-will-not-start/2882/10 "2020-09-03T00:05:25Z")
Thanks for clarifying, I’ve posted an update on the ticket @addons_zz created. ---
**Author:** ![whome](https://avatars.discourse-cdn.com/v4/letter/w/41988e/32.png) [@whome](https://forums.ankiweb.net/u/whome)\ **Post date:** [January 24, 2021, 4:51pm UTC](https://forums.ankiweb.net/t/anki-2-33-will-not-start/2882/11 "2021-01-24T16:51:28Z")
Confirmed - Fixed ---
**Author:** ![system](https://us1.discourse-cdn.com/flex002/uploads/anki2/original/1X/8f1279ababc5879d54e4838989f606cfe55af8c7.jpeg) [@system](https://forums.ankiweb.net/u/system)\ **Post date:** [May 1, 2023, 5:16am UTC](https://forums.ankiweb.net/t/anki-2-33-will-not-start/2882/12 "2023-05-01T05:16:33Z")