BUILDTOOL EXCEPTION

Pulling updates for /Users/blackscorpion/BuildData/.git
Successfully fetched updates!
Checked out: 9b100f8a6f0d86b5fd5f22f65dd6dd9eba6547d3
Pulling updates for /Users/blackscorpion/Bukkit/.git
Successfully fetched updates!
Checked out: b7b8f1e11ae7789a465f0e987be24161a1eba7df
Pulling updates for /Users/blackscorpion/CraftBukkit/.git
Successfully fetched updates!
Exception in thread "main" org.eclipse.jgit.api.errors.JGitInternalException: Exception caught during execution of reset command. {0}
	at org.eclipse.jgit.api.ResetCommand.call(ResetCommand.java:230)
	at org.spigotmc.builder.Builder.pull(Builder.java:520)
	at org.spigotmc.builder.Builder.main(Builder.java:257)
Caused by: org.eclipse.jgit.errors.LockFailedException: Cannot lock /Users/blackscorpion/CraftBukkit/.git/index
	at org.eclipse.jgit.dircache.DirCache.lock(DirCache.java:224)
	at org.eclipse.jgit.dircache.DirCache.lock(DirCache.java:301)
	at org.eclipse.jgit.dircache.DirCache.lock(DirCache.java:267)
	at org.eclipse.jgit.lib.Repository.lockDirCache(Repository.java:1052)
	at org.eclipse.jgit.api.ResetCommand.checkoutIndex(ResetCommand.java:390)
	at org.eclipse.jgit.api.ResetCommand.call(ResetCommand.java:203)
	... 2 more