Kaltura_Client_Exception thrown

Invalid KS "MTQzNTlmMTNlYzc0ZDQ1MWMzOWFkYWEwNmMxZDZlYjJlOWVjYmQ0NXwxMDE7OzE0Njc1MTk4MzE7MjsxNDY3NDMzNDMxLjYyNzY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"