Kaltura_Client_Exception thrown

Invalid KS "NzAzYjdlZmMyYjU1Y2I4ZWMzYjk1NWYxOTBmOGMwMWFlMWRlZjJmNXwxMDE7OzE0NzUxMDk1OTM7MjsxNDc1MDIzMTkzLjA2NTM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"