Solution for the error 31203:
To use launch references, all the servers in the specified farm must run XenDesktop or Presentation Server 4.5 or later. Citrix recommends that all servers in a farm run the same product and version. If the farm is running XenApp 4.0, with Feature Pack 1, for UNIX or Presentation Server 4.0 and earlier, ensure that the RequireLaunchReference parameter is set to Off and that OverrideIcaClientname is set to On in the XenApp Web site configuration file, WebInterface.conf.
