Kaltura_Client_Exception thrown

Invalid KS "MDI4NDNmMGI2Y2U4ZjczZTlhOGRjOTY5YWFiMjYxZWVjZDAwOGZmZXwxMDE7OzE0ODc2NTE0Njg7MjsxNDg3NTY1MDY4LjI5NjM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"