WebTop4 and Samba4 AD on NS 7

After I have followed the installation procedure as described here:

Failed to get machine PTY: No such file or directory

I have installed and configured these packages from Software center:

  • Email (Email server and filter)
  • POP3 proxy (Intercept POP3 connections and scan messages for virtus and spam)
  • SMTP proxy (SMTP proxy)
  • Basic firewall (Configure network adapters and basic firewall) - automatically installed

Then, I have installed

  • WebTop groupware (WebTop groupware)
    package from Software center.

After I have launched the WebTop app from Status -> Application and I introduced the login credentials (Username: admin; Password: admin), the following error page has appeared, even if the server was rebooted (please see the attached print screen).

Link for “Tomcat” folder from /var/log:

https://drive.google.com/open?id=0B1DQ23OY7TYkTm8yd0JibnFhSlk

Please advise!

PS:
Is not the first time when I encountered this issue.
At those times, there were only simple tests to see how WebTop looks and I solved by reinstalling the NS. So, is not related to the “PTY” issue.