Kaltura_Client_Exception thrown

Invalid KS "Zjg4NmY5MWY1MjhiYWQ5N2Y0NWZmNjlmYzdhMzNlYjZjZTgyZDZkNXwxMDE7OzE0ODE0MjY0ODU7MjsxNDgxMzQwMDg1LjAyMTI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"