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I've been using forge for a long time for mods, but now whenever I try to install forge I get this in the log.

Exception in thread "main" java.lang.ExceptionInInitializerErrorException in thread "main" java.lang.ExceptionInInitializerError

at net.minecraftforge.installer.ClientInstall.getSponsorMessage(ClientInstall.java:326)

at net.minecraftforge.installer.InstallerAction.getSponsorMessage(InstallerAction.java:59)

at net.minecraftforge.installer.InstallerPanel.updateFilePath(InstallerPanel.java:236)

at net.minecraftforge.installer.InstallerPanel.<init>(InstallerPanel.java:217)

at net.minecraftforge.installer.SimpleInstaller.launchGui(SimpleInstaller.java:153)

at net.minecraftforge.installer.SimpleInstaller.main(SimpleInstaller.java:40)

Caused by: java.lang.ArrayIndexOutOfBoundsException: 1

at net.minecraftforge.installer.MirrorData.buildMirrorList(MirrorData.java:84)

at net.minecraftforge.installer.MirrorData.<init>(MirrorData.java:63)

at net.minecraftforge.installer.MirrorData.<clinit>(MirrorData.java:17)

... 6 more

Does anyone have any idea how to resolve this?