Kaltura_Client_Exception thrown

Invalid KS "MjA1MjlmZGMxNmFlZTZiNzYxYjZlMGRkMmM0OGE1ODRiODI3OThhZnwxMDE7OzE0OTU3MzUyMDA7MjsxNDk1NjQ4ODAwLjQ5MDk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"