[Help needed] Problem opening project

[TehStoneMan]

I am trying to get started with NeoForge in order to update my mods, but I keep getting the following errors in Eclipse:

Archive for required library: 'D:/Minecraft Dev/MDK/.gradle/repositories/ng_dummy_ng/net/minecraft/client/1.20.4/client-1.20.4-client-extra.jar' in project 'MDK' cannot be read or is not a valid ZIP file
Archive for required library: 'D:/Minecraft Dev/MDK/.gradle/repositories/ng_dummy_ng/net/neoforged/neoforge/20.4.170/neoforge-20.4.170.jar' in project 'MDK' cannot be read or is not a valid ZIP file
Archive for required library: 'D:/Minecraft Dev/MDK/.gradle/repositories/ng_dummy_ng/net/neoforged/neoforge/20.4.170/neoforge-20.4.170.jar' in project 'MDK' cannot be read or is not a valid ZIP file
Build path contains duplicate entry: 'D:Minecraft Dev/MDK/.gradle/repositories/ng_dummy_ng/net/neoforged/neoforge/20.4.170/neoforge-20.4.170.jar' for project 'MDK'
The project cannot be built until build path errors are resolved

The problem files are 0 sized .jar files. I have updated gradle, refreshed dependencies, cleaned and rerun the Eclipse tasks, even manually deleted these files, but they just keep returning.