Kaltura_Client_Exception thrown

Invalid KS "Y2U1MDgwNzg0YzA2NzQ5NWY2Y2E4YjkyYjMzMmQ1OWQxOTUyZjc4NHwxMDE7OzE0OTMzMTQ3MDI7MjsxNDkzMjI4MzAyLjA3MTg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"