Unable to restart Python applications

Issue

Unable to restart Python applications.
Logs/commands output:

ERROR in Python Selector WEB:
No such application (or application not configured) "testpythonapp" 

Environment

• CloudLinux
• Python Selector
• cPanel

Solution

Ensure that 

• the  htaccess_cache file within the user's /home/exampleuser/.cl.selector directory owned by the user. For instance, exampleuser
• Check and fix document root permission. If cPanel "Enable FileProtect" is turned On, set  "public_html 750 with the group set to "nodbody", otherwise set "public_html" 755

  # [ -e /var/cpanel/fileprotect ] && find /home -type d -name public_html \( ! -perm 750 -o ! -group nobody \) -exec chmod 750 {} \; -exec chgrp nobody {} \; || find /home -type d -name public_html ! -perm 755 -exec chmod 755 {} \;

If, after that, another error pops up:

Virtual environment already exists (/home/USERNAME/virtualenv/APPNAME/3.9). Probably it is used by another application. Please, remove directory if it is no longer needed. 

Remove virtualenv/APPNAME/3.9 and .htaccess:

mv /home/USERNAME/virtualenv/APPNAME/3.9 /.../BACKUP_LOCATION
mv /home/USERNAME/app-url.domain.tld/.htaccess /.../BACKUP_LOCATION

 

Cause

Incorrect permissions.

Useful links

• https://www.thegeekstuff.com/2012/06/chown-examples/