Kaltura_Client_Exception thrown

Invalid KS "NjllZmMyOTJlOWJmY2YxYmZhZDcxODMyZDRhMjNhZjVjY2QwOTI5YXwxMDE7OzE0OTU5ODE3OTM7MjsxNDk1ODk1MzkzLjY3MzU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"