Kaltura_Client_Exception thrown

Invalid KS "ZjNlMmFmNThiNTIxYzJiNDUxYmVjMWM3Nzk1ZTVlNmYzYzcyOTQ5YnwxMDE7OzE0NzUyNDUyODM7MjsxNDc1MTU4ODgzLjgxOTQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"