Kaltura_Client_Exception thrown

Invalid KS "N2Y0OWM4OTY2Njc2YmU1Mzc1ODJhNjlhZmNhZjQ2ODFmZTMzYjcxZXwxMDE7OzE0NzQ4ODEyMzQ7MjsxNDc0Nzk0ODM0LjI1NTtBbm9ueW1vdXM7ZWRpdDoq", Error "-1,INVALID_STR"