Netbeans 8.1 could not install some modules

"ctajuggler" <[email protected]>
Newsgroups gmane.comp.java.netbeans.modules.openide.devel
Message-ID <[email protected]> 
I'm building a netbeans platform application on Netbeans 8.1.

I've added a bunch of module dependencies and the application compiles fine, but when I try to run it I get:

org.netbeans.modules.xml.xam - No module providing the capability org.netbeans.modules.xml.xam.spi.ModelAccessProvider could be found.
	org.netbeans.modules.xml.xam - No module providing the capability org.netbeans.modules.xml.xam.spi.DocumentModelAccessProvider could be found.
	org.netbeans.modules.debugger.jpda - None of the modules providing the capability org.netbeans.spi.debugger.jpda.SourcePathProvider could be installed.
	org.netbeans.modules.debugger.jpda - None of the modules providing the capability org.netbeans.spi.debugger.jpda.EditorContext could be installed.
.
.
. (+ many others)

I've seen other forum posts reporting something similar e.g. https://forums.netbeans.org/topic63631.html

I've tried deleting the netbeans user and cache directories and restarting netbeans, but I get the same error.

Any ideas?
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