Kaltura_Client_Exception thrown

Invalid KS "NWEzN2RhNTNhMzY2OGVkY2QwMDZiNDdjY2Q5NTNkODBiMDVmMGFlNXwxMDE7OzE0NzUyNDk2MzU7MjsxNDc1MTYzMjM1Ljc4Njc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"