This error signifies that Silk Performer cannot find the specified file.  It can occur after exporting a project then opening and running on a different machine, or when running a test using an agent machine.

To resolve this error please add the file named in the error message to the Silk Performer “Data Files” section.

Right-click on “Data Files” and chose “Add Data File…”:

Browse to the file that you want to add:

File is now added into the data files section and will be passed to the agents, packaged with the project when exported: