wg++ giving me a crtcal error in Linux Mint 18

Hi.

I have been running WebGrab for 3 years now `, first in Windows 7 computers and layely in my new Mini PC which was on Windows 10.  I installed Linux Mint 18 and last night installed Webgrab ad it is givng me this error

Job started at 28/03/2018 17:29:26
[  Debug ]
[  Debug ] Running  on: Unix 4.10.0.38
[  Debug ] Environment: 4.0.30319.17020
[  Debug ] Mono version: 4.2.1 (Debian 4.2.1.102+dfsg2-7ubuntu4)
[  Debug ]
[  Debug ] Loading timezone data
[  Debug ] Embedded timezones source: WGconsole.WG.Common.timezonesdata.txt
[  Debug ] Reading config file: /home/fallito/.wg++/WebGrab++.config.xml
[  Info  ] found: /home/fallito/.wg++/siteini.pack/Spain/plus.es.ini -- Revision 10
[  Info  ] input file /home/fallito/.wg++/smb://FALLITO-MINI-PC/M3U/guide.xml not found   ... created a new one ...
[  Info  ]
[  Info  ]
[  Info  ]       i=index  .=same  c=change  g=gab  r=replace  n=new
[  Info  ]
[  Info  ]
[  Info  ] Group (0) :
[  Info  ] update requested for - 15 - out of - 15 - channels for 1 day(s)
[  Debug ]
[  Info  ] (   1/15  ) PLUS.ES -- chan. (xmltv_id=LA 1) -- mode Force
[        ] Job finished at 28/03/2018 17:29:27 done in 0s
[Critical] Unhandled Exception
[Critical]
Could not load file or assembly 'System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies.
[Critical]
  at WGconsole.Program.ConsoleApplication (System.String[] args) <0x40fff000 + 0x0750f> in <filename unknown>:0
  at WGconsole.Program.Main (System.String[] args) <0x40ff6f60 + 0x00087> in <filename unknown>:0
[Critical] For detailed info, see log file /home/fallito/.wg++/WebGrab++.log.txt
[Critical] Execution stopped

Any Ideas?