Camtasia studio cannot complete the production of a project

Hi all,
When I try to play a video in Camtasia studio, I got ended up with an error message. This means Camtasia studio not able to decode my video to read frames out of it. Thought this will be of this particular video, so tried with other videos too. Nothing happened error remains the same. What do I do now to solve this error? Hunting for solutions please help me.

We’re sorry! An error has occurred with the following clip on the timeline: C:UsersThomasDownloadshl220130619 225553161.avi
Camtasia studio cannot complete the production of this project.
