Alguien sabe cómo resolver esto? Probé muchas cosas, pero ninguna de ellas funcionó.

Y cuando hago clic en más detalles obtengo esto:

at sun.security.provider.JavaKeyStore.engineLoad(Unknown Source)
atsun.security.provider.JavaKeyStore$JKS.engineLoad(Unknown Source)
at java.security.KeyStore.load(Unknown Source)
at com.sun.deploy.security.RootCertStore$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.deploy.security.RootCertStore.loadCertStore(Unknown Source)
at com.sun.deploy.security.RootCertStore.load(Unknown Source)
at com.sun.deploy.security.RootCertStore.load(Unknown Source)
at com.sun.deploy.security.ImmutableCertStore.load(Unknown Source)
at com.sun.deploy.security.TrustDecider.isAllPermissionGranted(Unknown Source)
at com.sun.deploy.security.TrustDecider.isAllPermissionGranted(Unknown Source)
at sun.plugin.security.PluginClassLoader.getPermissions(Unknown Source)
at java.security.SecureClassLoader.getProtectionDomain(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$000(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)