Fix
In these cases
cd /home/user/.cpanel
Remove the following files in it
rm -rf email_accounts.cache email_accounts_count email_accounts.yaml email_accounts.yaml.lock
Login to cPanel again
The cache file will be created automatically
Some Quick Fixes and Resolutions by Linux Enthusiast
Fix
In these cases
cd /home/user/.cpanel
Remove the following files in it
rm -rf email_accounts.cache email_accounts_count email_accounts.yaml email_accounts.yaml.lock
Login to cPanel again
The cache file will be created automatically