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Error running Telethon bot script on "Always on Task": Unable to open database file

I'm having trouble running an "Always-on tasks" process with a Python script that starts a bot using the Telethon library. To execute the script, I'm using the following command:

source virtualenvwrapper.sh && workon myvirtualenv && chmod 777 /home/massimocascone/WellnessCommunitybot/script.py && python3.10 /home/massimocascone/WellnessCommunitybot/script.py

However, when I run it, I receive an error message that reads:

Mar 17 19:47:51 Traceback (most recent call last):
Mar 17 19:47:51   File "/home/massimocascone/WellnessCommunitybot/script.py", line 11, in <module>
Mar 17 19:47:51     client = TelegramClient(config.session_name_bot, config.API_ID, config.API_HASH).start(bot_token=config.BOT_TOKEN)
Mar 17 19:47:51   File "/home/massimocascone/.virtualenvs/myvirtualenv/lib/python3.10/site-packages/telethon/client/telegrambaseclient.py", line 275, in __init__
Mar 17 19:47:51     session = SQLiteSession(session)
Mar 17 19:47:51   File "/home/massimocascone/.virtualenvs/myvirtualenv/lib/python3.10/site-packages/telethon/sessions/sqlite.py", line 47, in __init__
Mar 17 19:47:51     c = self._cursor()
Mar 17 19:47:51   File "/home/massimocascone/.virtualenvs/myvirtualenv/lib/python3.10/site-packages/telethon/sessions/sqlite.py", line 242, in _cursor
Mar 17 19:47:51     self._conn = sqlite3.connect(self.filename,
Mar 17 19:47:51 sqlite3.OperationalError: unable to open database file

Can someone assist me with resolving this issue?

Beloved premium user massimocascone | 2 posts | March 17, 2023, 7:51 p.m. | permalink

It looks like telethon is trying to use a database but for some reason it can't open it -- maybe check in the documentation for how to set up this. Also, a hint, when you're developing an always-on task script, I'd suggest using Bash console first, because it's much faster and you can add breakpoints, etc., to debug the code.

Staff pafk | 3216 posts | PythonAnywhere staff | March 18, 2023, 7:47 a.m. | permalink

Hello, thank you for your response. The problem is that when i execute the command:

python3.10 /home/massimocascone/WellnessCommunitybot/script.py

on a bash console everything goes well, and the problem does not happen. I found out that maybe the script.py does not have writing permission to create the file session file that telethon needs to work, but i used the chmod command with 777 so it should work...

Beloved premium user massimocascone | 2 posts | March 18, 2023, 9:18 a.m. | permalink

Do you know where it's looking for the database? Can you configure that?

Staff pafk | 3216 posts | PythonAnywhere staff | March 18, 2023, 1:07 p.m. | permalink