Hi codesroots,

First, please note that the demo mentioned refer to Andorid Client API 3.0 compatible with Lightstreamer Server since version 6.1.
Since you use a server 5.1.x you should revert to this previous example: https://github.com/Lightstreamer/Lig...client-android.
Otherwise you should consider to upgrade the Lightstreamer server version.

Regards,
Giuseppe