[JAVA] Problème

Bonjour,

J'utilise un prologiciel au sein de mon entreprise, et je rencontre un problème lors de l'ouverture d'un logiciel où sont stockées des informations dont j'ai besoin.
Lorsque je clique sur un fichier via ce logiciel, il ne se passe rien, et j'ai ma console java qui s'ouvre m'indiquant :

java.lang.UnsupportedClassVersionError: Bad version number in .class file 
 at java.lang.ClassLoader.defineClass1(Native Method) 
 at java.lang.ClassLoader.defineClass(Unknown Source) 
 at java.security.SecureClassLoader.defineClass(Unknown Source) 
 at java.net.URLClassLoader.defineClass(Unknown Source) 
 at java.net.URLClassLoader.access$100(Unknown Source) 
 at java.net.URLClassLoader$1.run(Unknown Source) 
 at java.security.AccessController.doPrivileged(Native Method) 
 at java.net.URLClassLoader.findClass(Unknown Source) 
 at sun.applet.AppletClassLoader.findClass(Unknown Source) 
 at java.lang.ClassLoader.loadClass(Unknown Source) 
 at sun.applet.AppletClassLoader.loadClass(Unknown Source) 
 at java.lang.ClassLoader.loadClass(Unknown Source) 
 at sun.applet.AppletClassLoader.loadCode(Unknown Source) 
 at sun.applet.AppletPanel.createApplet(Unknown Source) 
 at sun.plugin.AppletViewer.createApplet(Unknown Source) 
 at sun.applet.AppletPanel.runLoader(Unknown Source) 
 at sun.applet.AppletPanel.run(Unknown Source) 
 at java.lang.Thread.run(Unknown Source) 
Exception in thread "Thread-4" java.lang.NullPointerException 
 at sun.plugin.util.GrayBoxPainter.showLoadingError(Unknown Source) 
 at sun.plugin.AppletViewer.showAppletException(Unknown Source) 
 at sun.applet.AppletPanel.runLoader(Unknown Source) 
 at sun.applet.AppletPanel.run(Unknown Source) 
 at java.lang.Thread.run(Unknown Source) 
java.lang.NullPointerException 
 at sun.plugin.util.GrayBoxPainter.showLoadingError(Unknown Source) 
 at sun.plugin.AppletViewer.showAppletStatus(Unknown Source) 
 at sun.applet.AppletPanel.run(Unknown Source) 
 at java.lang.Thread.run(Unknown Source) 
Exception in thread "thread applet-qualnet" java.lang.NullPointerException 
 at sun.plugin.util.GrayBoxPainter.showLoadingError(Unknown Source) 
 at sun.plugin.AppletViewer.showAppletException(Unknown Source) 
 at sun.applet.AppletPanel.run(Unknown Source) 
 at java.lang.Thread.run(Unknown Source)

Quelqu'un sait d'où vient le problème de cette non ouverture de mes fichiers ?

Merci d'avance



Cordialement,

Mezzzman