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I am creating my own mod and get this error.

org.mozilla.javascript.WrappedException: Wrapped java.lang.NullPointerException: Attempt to invoke interface method 'java.lang.Object org.mozilla.javascript.Scriptable.get(java.lang.String, org.mozilla.javascript.Scriptable)' on a null object reference (MSBM.js#4)

at org.mozilla.javascript.Context.throwAsScriptRuntimeEx(Unknown Source)

at org.mozilla.javascript.MemberBox.invoke(Unknown Source)

at org.mozilla.javascript.FunctionObject.call(Unknown Source)

at org.mozilla.javascript.Interpreter.interpretLoop(Unknown Source)

at script(MSBM.js:4)

at org.mozilla.javascript.Interpreter.interpret(Unknown Source)

at org.mozilla.javascript.InterpretedFunction.call(Unknown Source)

at org.mozilla.javascript.ContextFactory.doTopCall(Unknown Source)

at org.mozilla.javascript.ScriptRuntime.doTopCall(Unknown Source)

at org.mozilla.javascript.InterpretedFunction.exec(Unknown Source)

at net.zhuoweizhang.mcpelauncher.ScriptManager.initJustLoadedScript(ScriptManager.java:267)

at net.zhuoweizhang.mcpelauncher.ScriptManager$ParseThread.run(ScriptManager.java:192)

at java.lang.Thread.run(Thread.java:818)

Caused by: java.lang.NullPointerException: Attempt to invoke interface method 'java.lang.Object org.mozilla.javascript.Scriptable.get(java.lang.String, org.mozilla.javascript.Scriptable)' on a null object reference

at org.mozilla.javascript.ScriptableObject.getProperty(Unknown Source)

at net.zhuoweizhang.mcpelauncher.ScriptManager.expandShapelessRecipe(ScriptManager.java:1431)

at net.zhuoweizhang.mcpelauncher.ScriptManager.access$2200(ScriptManager.java:58)

at net.zhuoweizhang.mcpelauncher.ScriptManager$NativeItemApi.addCraftRecipe(ScriptManager.java:3585)

at java.lang.reflect.Method.invoke(Native Method)

at java.lang.reflect.Method.invoke(Method.java:372)

... 11 more

Copy ur script here