Hi dimitran,
I can't see the screenshot, it seems that it's a wrong link, btw the only way out I see is, before running your lightstreamer-related code, check if the libraries are loaded and if not delay your code and try to load them.

If it's the alert that bothers you, you should upgrade the library or modify lspushpage.js and lsengine.js (the alert call is one of the first things in the code).
I insert these files in GWT module
sorry but I don't know what this implies.

so they cannot be not loaded before the engine calls initialize.
if those were loaded you would not see the "Warning: lscommons.js not included before lspushpage.js" alert. Do you still see the alert right?