Major error while loading server

[Techy4198]

Loaded the prebuilt jar and this happened. I tried both the latest stable build and the latest beta, both pretty much the same thing.
Also it takes about half a minute before anything appears in the console window at all.

[20:20:44] [Granite Startup/WARN]: Could not find Minecraft .jar, downloading
[20:21:22] [Granite Startup/INFO]: Minecraft Downloaded
[20:21:22] [Granite Startup/INFO]: Loading Minecraft 1.8.1 with protocol 47
[20:21:22] [Granite Startup/INFO]: Querying Granite for updates
[20:21:22] [Granite Startup/WARN]: Could not find mappings.json
[20:21:22] [Granite Startup/WARN]: Downloading from https://raw.githubusercontent.com/GraniteTeam/GraniteMappings/sponge/1.8.1.json
[20:21:24] [Granite Startup/INFO]: Modifying bytecode
[20:25:06] [Granite Startup/ERROR]: We did a REALLY BIG boo-boo :'(
java.lang.RuntimeException: getCurrentItem not found in mappings
    at org.granitepowered.granite.bytecode.BytecodeClass.implement(BytecodeClass.java:348) ~[granite.jar:?]
    at org.granitepowered.granite.bytecode.BytecodeModifier.modify(BytecodeModifier.java:72) ~[granite.jar:?]
    at org.granitepowered.granite.GraniteStartupThread.modifyBytecode(GraniteStartupThread.java:327) ~[granite.jar:?]
    at org.granitepowered.granite.GraniteStartupThread.run(GraniteStartupThread.java:157) [granite.jar:?]

I thought it could be my antivirus screwing with the downloads, but it still occurs with the program completely disabled.
Before you say, I tried deleting all files created by this process and starting again, multiple times with both versions, to no avail.

[Voltasalt]

Fixed, try now.

[Techy4198]

Latest beta works, latest stable has a slightly different error. This time it can't find setPosition.
Error lines: (Idk if this is helpful)
BytecodeClass:260
BytecodeModifier:71
GraniteStartupThread:290
GraniteStartupThread:144

Note: There may be even more errors with other versions, but people are likely going to go for the latest beta/stable at the moment.

[N0odlez]

Please us the latest jenkins build posible please as the mappings are changing as we are chaning our code.

[N0odlez]

@Techy4198 Are you receiving this error on our latest builds?

[Techy4198]

@AzureusNation The latest 'development build' works fine, but the latest 'recommended release' build does not. I assume that the missing things in mappings.json will change almost every time that a new version of it is published to the main download.

[N0odlez]

We are still thinking on how we are going to push out these mappings and how they are controlled with updates but I think I have a solid plan that I am going to propose to the team soon.