Cannot save Storyline project Boolean System Threading error By Julie Rosler “Articulate Storyline” -when I attempt to save my project, I receive the following error: “The project file could not be saved. Method not found: ‘Boolean System. Threading. WaitHandle. WaitOne (System.TimeSpan)’. Option to click “OK” I tried to save the project to my documents (received the error) and also tried to save to C Drive. I have downloaded the program again....and continue to receive the error when I attempt to save. Any help would be appreciated. Thanks.