Kaltura_Client_Exception thrown

Invalid KS "YmQ3MzQwZDY0NjliYzU0NDM2OTM1ODI0MDRkYmM2NzFlNmE0ZGQxYnwxMDE7OzE0OTgzOTQ2MTk7MjsxNDk4MzA4MjE5LjA3MTM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"