Exception starting GUI in RC-4

$ java -jar NuBot.jar -GUI -skipCredentials
23:20:02.780 [main] INFO  - defined session log path logs/idles/1433715602778 [com.nubits.nubot.bot.Global:94]
23:20:02.823 [main] DEBUG - checking latest version [com.nubits.nubot.launch.MainLaunch:64]
23:20:03.693 [main] DEBUG - Latest Version = 0.3.0, Current version = 0.3.1-RC4 [com.nubits.nubot.utils.VersionInfo:132]
23:20:03.860 [main] WARN  - Your version of NuBot (0.3.1-RC4) is not updated. A newer version (0.3.0) is available for download at https://bitbucket.org/JordanLeePeershares/nubottrading/downloads [c.n.n.l.MainLaunch:71]
23:20:03.866 [main] WARN  - Official credential skipped. Will use user-defined credentials defined in source of CredentialManager.java [c.n.n.l.MainLaunch:77]
23:20:03.873 [main] INFO  - Running NuBot with GUI [com.nubits.nubot.launch.MainLaunch:96]
23:20:03.874 [main] INFO  - Setting default config file location :config/nubot-config.json [com.nubits.nubot.launch.MainLaunch:99]
23:20:03.875 [main] WARN  - Detected a non-empty configuration file, resetting it to default. Printing existing file content, for reference:
{"apiKey":"","apiSecret":"","mailRecipient":"","exchangeName":"","dualSide":true,"pair":"nbt_btc","rpcUser":"","rpcPass":"","nubitAddress":"","nudPort":9091,"bypassStreaming":false,"streamingserver":"stream.tradingbot.nu:5556","nudIp":"127.0.0.1","mailnotifications":"SEVERE","submitLiquidity":true,"executeOrders":true,"verbosity":"normal","gitter":true,"multipleCustodians":false,"txFee":0.2,"priceIncrement":3.0E-4,"emergencyTimeout":60,"keepProceeds":0.0,"maxSellVolume":0.0,"maxBuyVolume":0.0,"distributeLiquidity":false,"wallchangeThreshold":0.15,"spread":0.8,"webport":8889,"mainFeed":"bitfinex","backupFeeds":["blockchain","bitcoinaverage","coinbase","bitstamp"]} [c.n.n.l.MainLaunch:103]
23:20:03.875 [main] INFO  - file config/nubot-config.json deleted! [com.nubits.nubot.utils.FilesystemUtils:41]
23:20:03.922 [main] INFO  - Options saved on config/nubot-config.json [com.nubits.nubot.options.SaveOptions:66]
23:20:03.936 [main] WARN  - wallShiftThreshold and spread will be taken from Streamer service (local settings ignored) [c.n.n.o.ParseOptions:467]
23:20:03.941 [main] INFO  - start ui server. configfile config/nubot-config.json [com.nubits.nubot.webui.UiServer:51]
23:20:03.941 [main] INFO  - launching on http://localhost:8889 [com.nubits.nubot.webui.UiServer:56]
Exception in thread "main" java.lang.NoSuchMethodError: spark.Spark.port(I)V
        at com.nubits.nubot.webui.UiServer.startUIserver(UiServer.java:58)
        at com.nubits.nubot.launch.MainLaunch.main(MainLaunch.java:123)
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