Kaltura_Client_Exception thrown

Invalid KS "MTZkZGRhMjg5OWQ0MDMwMmVhYWUxMmQ1ZTcxN2VhMjdiMDkxMzcwOHwxMDE7OzE0ODUwNjY0NDQ7MjsxNDg0OTgwMDQ0Ljc3OTM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"