Kaltura_Client_Exception thrown

Invalid KS "ZjQ5ZGIwZGZhMmNlNjc4NTcwMWJjODgwOTk2ZDNkMTZlZDUwNjhlY3wxMDE7OzE0ODUyMDQ0MDc7MjsxNDg1MTE4MDA3Ljk3Mjg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"