cPanel Webmail error 404 on paper_lantern theme after RVskin uninstalled

After finished RVskin uninstall. cPanel webmail in paper_lantern theme has the error 404. (X3 theme will not face this error)
URL reference: ../webmail/{RVTHEME}/index.html

You can fix the error by the following guide.
1.  Go to WHM -> Server Configuration -> Tweak Settings.
2.  Search “webmail” in the Search Box.
3.  Once the screen appears, at “Default login theme”, select “cPanel”.
4.  Save.

If doing above still doesn’t fix the error. Please try below.
1.  SSH to your server as root.
2.  Check if the following path does exist.
/usr/local/cpanel/base/webmail/paper_lantern
3.  If doesn’t exist. Please create a symbolic link as below.
ln -s /usr/local/cpanel/base/webmail/x3 /usr/local/cpanel/base/webmail/paper_lantern
4. Check cPanel webmail in paper_lantern again.

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Remove RVskin from paper_lantern
Remove the icon the this file:
/usr/local/cpanel/base/frontend/paper_lantern/dynamicui/dynamicui_rvskin_theme_changer.conf
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