Invalid Bean construtor error

[Edson Alves Pereira]

        Hello folks, i�m having this error on one of my webapps, all of them
use the same library:

2003-02-27 11:39:40 StandardManager[/intranet] IOException while loading
persisted sessions: java.io.InvalidClassException: appi.beans.html.JTable;
no valid constructor
java.io.InvalidClassException: appi.beans.html.JTable; no valid constructor

        What i must do?

        With best wishes,
        Edson Alves Pereira