Kaltura_Client_Exception thrown

Invalid KS "OGE4OTYyOTdkOTgyMTU0ZGY1N2Q2YzhkMjI5NTRjNTUyMjUzMjE2MXwxMDE7OzE0NzUzMjQyNzc7MjsxNDc1MjM3ODc3LjU3NjM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"