Estou passando por um problema com o Multi-envio de imagem no Phoca gallery, ele é feito em Java e ta dando um erro na tela de envio:

Alguém já passou por isso?? Tem idéia do que seja?
Log de erro que aparece no meu console Java:
java.lang.NullPointerException
at sun.plugin.viewer.LifeCycleManager.startAppletPanel(LifeCycleManager.java:144)
at sun.plugin.viewer.WNetscapePluginObject.startPlugin(WNetscapePluginObject.java:389)
at sun.plugin.viewer.WNetscapePluginObject$Initer.run(WNetscapePluginObject.java:309)
java.lang.UnsupportedClassVersionError: wjhk/jupload2/JUploadApplet (Unsupported major.minor version 49.0)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:509)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:246)
at java.net.URLClassLoader.access$100(URLClassLoader.java:54)
at java.net.URLClassLoader$1.run(URLClassLoader.java:193)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:186)
at sun.applet.AppletClassLoader.findClass(AppletClassLoader.java:132)
at sun.plugin.security.PluginClassLoader.findClass(PluginClassLoader.java:189)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.applet.AppletClassLoader.loadClass(AppletClassLoader.java:112)
at java.lang.ClassLoader.loadClass(ClassLoader.java:262)
at sun.applet.AppletClassLoader.loadCode(AppletClassLoader.java:473)
at sun.applet.AppletPanel.createApplet(AppletPanel.java:548)
at sun.plugin.AppletViewer.createApplet(AppletViewer.java:1621)
at sun.applet.AppletPanel.runLoader(AppletPanel.java:477)
at sun.applet.AppletPanel.run(AppletPanel.java:290)
at java.lang.Thread.run(Thread.java:536)
java.lang.UnsupportedClassVersionError: wjhk/jupload2/JUploadApplet (Unsupported major.minor version 49.0)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:509)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:246)
at java.net.URLClassLoader.access$100(URLClassLoader.java:54)
at java.net.URLClassLoader$1.run(URLClassLoader.java:193)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:186)
at sun.applet.AppletClassLoader.findClass(AppletClassLoader.java:132)
at sun.plugin.security.PluginClassLoader.findClass(PluginClassLoader.java:189)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.applet.AppletClassLoader.loadClass(AppletClassLoader.java:112)
at java.lang.ClassLoader.loadClass(ClassLoader.java:262)
at sun.applet.AppletClassLoader.loadCode(AppletClassLoader.java:473)
at sun.applet.AppletPanel.createApplet(AppletPanel.java:548)
at sun.plugin.AppletViewer.createApplet(AppletViewer.java:1621)
at sun.applet.AppletPanel.runLoader(AppletPanel.java:477)
at sun.applet.AppletPanel.run(AppletPanel.java:290)
at java.lang.Thread.run(Thread.java:536)