Error ouput

command: java -jar directory/sponge.jar run

console output:

Sponge v1.8-1487-2.1DEV-520+unknown-b520.git-unknown for Minecraft Forge 1487
   implementing SpongeAPI version 2.1-SNAPSHOT
:: retrieving :: spongepowered#spongeruntime
java.io.IOException: Ivy file not found in cache for spongepowered#spongeruntime;[email protected]!
	at org.apache.ivy.core.retrieve.RetrieveEngine.getConfs(RetrieveEngine.java:265)
	at org.apache.ivy.core.retrieve.RetrieveEngine.retrieve(RetrieveEngine.java:105)
	at org.apache.ivy.Ivy.retrieve(Ivy.java:561)
	at org.spongepowered.launch.IvyHandler.retrieve(IvyHandler.java:104)
	at org.spongepowered.launch.handlers.RunHandler.run(RunHandler.java:72)
	at org.spongepowered.launch.Main.dispatch(Main.java:134)
	at org.spongepowered.launch.Main.main(Main.java:82)
Caused by: java.lang.IllegalStateException: Ivy file not found in cache for spongepowered#spongeruntime;[email protected]!
	at org.apache.ivy.core.cache.DefaultResolutionCacheManager.getResolvedModuleDescriptor(DefaultResolutionCacheManager.java:142)
	at org.apache.ivy.core.retrieve.RetrieveEngine.getConfs(RetrieveEngine.java:257)
	... 6 more
logout

[Process completed]