Kaltura_Client_Exception thrown

Invalid KS "NDQyYjNkNzYzZmM2OTc0NjU2ODE0MmJiNWY0MzNkZTRlNDAyZDk3OXwxMDE7OzE0OTg3OTc0MTI7MjsxNDk4NzExMDEyLjU2NjQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"