The error you are getting is because you do not have the Turbine utilities (also known as the Turbine Examples) installed and the Travel Window plugin depends on those samples. Go back to the download page for the Travel Window plugin. Right at the top of the description are installation instructions which tell you that the Turbine utilities are required and explains where to get them.
http://www.lotrointerface.com/downlo...velWindow.html
You can also install plugins using Lunarwater's Plugin Compendium which will also allow you to install the Turbine Examples:
Windows client:
http://www.lotrointerface.com/downlo...ompendium.html
Mac/Linux client:
http://www.lotrointerface.com/downlo...mMacLinux.html