Applet,erro Imagem

Ola pessoal tudo bom?
estou fazendo um applet aqui que utiliza figuras e talz,todas elas sao de exentensao .png
mas quando eu ponho o applet no servidor e tento abrir pelo site
eu recebo esse erro aqui
OBs:o applet esta assinado!!!

Uncaught error fetching image:
java.lang.SecurityException
	at java.lang.SecurityManager.checkPermission(Unknown Source)
	at java.lang.SecurityManager.checkConnect(Unknown Source)
	at sun.plugin2.applet.Applet2SecurityManager.checkConnect(Unknown Source)
	at sun.awt.image.URLImageSource.checkSecurity(Unknown Source)
	at sun.awt.image.ImageRepresentation.imageComplete(Unknown Source)
	at sun.awt.image.InputStreamImageSource.errorConsumer(Unknown Source)
	at sun.awt.image.InputStreamImageSource.errorAllConsumers(Unknown Source)
	at sun.awt.image.InputStreamImageSource.badDecoder(Unknown Source)
	at sun.awt.image.InputStreamImageSource.doFetch(Unknown Source)
	at sun.awt.image.ImageFetcher.fetchloop(Unknown Source)
	at sun.awt.image.ImageFetcher.run(Unknown Source)