Kaltura_Client_Exception thrown

Invalid KS "YmVhMjU4ZDM4Y2MyYzM5ODc4ODFlMGJlZTM2MTg4Njk2MWZmMTgwZHwxMDE7OzE0NzQ4Njg5MzA7MjsxNDc0NzgyNTMwLjEyNDk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"