Problem with loading Appl. as Applet

i have a 3D-Application and build it as Applet, that runs well. If I put it on a server and load it with my PC, it also runs. But on another PC while loading the Applet i get an Error-Message:

“An error occured while loading the applet.
Please contact support to resolve this issue.
This occured while ‘Downloading packages’”

Has anybody an idea what i have to do, to get the Applet running?

Thanks & Best Regards,