Hi

Make sure that all settings in the launch script are replicated in your launch configuration for Eclipse.
The reported problem may occur if the lightstreamer.native.path initialization is missing or the supplied path is not correct.
Assuming the "Lightstreamer" directory is used as the working directory, the JVM arguments should include:
-Dlightstreamer.native.path=lib/native
May you please check this first?

Dario