Kaltura_Client_Exception thrown

Invalid KS "MWQ4Y2Y3NzczYzQ4NDQyNDgwZmQzYzc1ZTQxYWJjOGE1MTE1YWU2Y3wxMDE7OzE0ODEzNDE2Mzk7MjsxNDgxMjU1MjM5LjIzMjE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"