There is more than one verb named '<verb>' for file type '<type>'
The Verb properties for two or more actions of the specified file type have the same name. Each action for a file type must specify a unique verb, usually the same as the name for the action.
To correct this error
Double-click the error in the Task List to go to the action in the File Types Editor.
In the Properties window, select the Verb property and enter a unique name.