Kaltura_Client_Exception thrown

Invalid KS "OThiNWI3NjQ0MWYzMmQ4ZjdjOWU0YzhhYjcyZjRkMDc1MjAyOTU3YnwxMDE7OzE0NzUyMjAzNDM7MjsxNDc1MTMzOTQzLjg4OTg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"