Hi Mario,

It seems you are using an Adapters configuration of the old Lightstreamer server 5.x but no longer supported in the new version 6.
Please, try with an adapters.xml like this:


Indeed, the issue was that the old configuration implies the use of a common class loader shared with the server, which is not supported anymore for Proxy Adapters.

Please let us know if you need any further clarifications.

Regards,
Giuseppe