I have been trying to open the pop up from the forge desktop app but it creates a notepad file with errors which I don't know how to fix(below is what the file says).
Exception 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