This error may occur if NetSim is not run as an administrator. 


To avoid this error while creating a new network scenario in NetSim:

  • Do not start NetSim directly by double clicking on NetSim shortcut present in your desktop.
  • Instead Open NetSim as administrator, by right clicking on NetSim shortcut in your desktop and selecting Run as administrator.

To avoid this error while opening a saved configuration file:

  • Do not open Configuration.netsim file by directly right clicking on in and selecting open with TETCOS NetSim
  • Instead Open NetSim as administrator, by right clicking on NetSim shortcut in your desktop and selecting Run as administrator.
  • Open the Configuration file using Open Network option available in NetSim Home Screen window.