Applet's error on Linux

[ATM]

Applet which reading some data from codebase server, it's allowing by security (JDK1.2), and search within all biggest engines, and working on both Netscape & Explorer on WinOS platform, but throw Error at Lunix OS with Netscape. You can test it, if have Linux, at
http://tair.virtualave.net/applet/hypers/index.html
What's a problem I still haven't understood?