Kaltura_Client_Exception thrown

Invalid KS "OTI4Y2QxZTk2OTg5OTIxNjVkMmU4MWFlZjZmZTAwZDk3YjVmNTgzOXwxMDE7OzE0NzQ4NDQ2NDU7MjsxNDc0NzU4MjQ1Ljg3OTI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"