Cause
This error occurs if a presentation client attempts to connect to an application server that is running an older version of JADE and the automatic download process is not supported across those releases. From JADE 6.3 onwards, the automatic thin client download supports only reverting the presentation client to the same or the prior major release (that is JADE 6.3 can revert to JADE 6.2 but not to JADE 6.1).
Action
If you want the presentation client to revert to an earlier version of JADE, re-install the JADE thin client software for the required version, or perform the automatic download in stages by connecting to application servers running the prior major releases, one after the other. For example, to revert from JADE 6.3 to 6.1, connect the presentation client to a JADE 6.2 application server and then to a JADE 6.1 application server.