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java.lang.NullPointerException: 	at org.embulk.exec.BulkLoader.doCleanup(BulkLoader.java:479)	at org.embulk.exec.BulkLoader$3.run(BulkLoader.java:410)	at org.embulk.exec.BulkLoader$3.run(BulkLoader.java:406)	at org.embulk.spi.Exec.doWith(Exec.java:25)	at org.embulk.exec.BulkLoader.cleanup(BulkLoader.java:406)	at org.embulk.EmbulkEmbed.run(EmbulkEmbed.java:184)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at org.jruby.javasupport.JavaMethod.invokeDirectWithExceptionHandling(JavaMethod.java:452)	at org.jruby.javasupport.JavaMethod.invokeDirect(JavaMethod.java:313)	at org.jruby.java.invokers.InstanceMethodInvoker.call(InstanceMethodInvoker.java:45)	at org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:313)	at org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:163)	at org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:316)	at org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:77)	at org.jruby.internal.runtime.methods.MixedModeIRMethod.INTERPRET_METHOD(MixedModeIRMethod.java:140)	at org.jruby.internal.runtime.methods.MixedModeIRMethod.call(MixedModeIRMethod.java:126)	at org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:273)	at org.jruby.runtime.callsite.CachingCallSite.callBlock(CachingCallSite.java:79)	at org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:83)	at org.jruby.ir.instructions.CallBase.interpret(CallBase.java:414)	at org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:348)	at org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:77)	at org.jruby.ir.interpreter.InterpreterEngine.interpret(InterpreterEngine.java:86)	at org.jruby.internal.runtime.methods.MixedModeIRMethod.INTERPRET_METHOD(MixedModeIRMethod.java:210)	at org.jruby.internal.runtime.methods.MixedModeIRMethod.call(MixedModeIRMethod.java:196)	at org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:197)	at org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:313)	at org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:163)	at org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:316)	at org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:77)	at org.jruby.ir.interpreter.Interpreter.INTERPRET_ROOT(Interpreter.java:112)	at org.jruby.ir.interpreter.Interpreter.execute(Interpreter.java:99)	at org.jruby.ir.interpreter.Interpreter.execute(Interpreter.java:35)	at org.jruby.ir.IRTranslator.execute(IRTranslator.java:42)	at org.jruby.Ruby.runInterpreter(Ruby.java:833)	at org.jruby.Ruby.loadFile(Ruby.java:2905)	at org.jruby.runtime.load.LibrarySearcher$ResourceLibrary.load(LibrarySearcher.java:235)	at org.jruby.runtime.load.LibrarySearcher$FoundLibrary.load(LibrarySearcher.java:34)	at org.jruby.runtime.load.LoadService.tryLoadingLibraryOrScript(LoadService.java:900)	at org.jruby.runtime.load.LoadService.smartLoadInternal(LoadService.java:541)	at org.jruby.runtime.load.LoadService.requireCommon(LoadService.java:426)	at org.jruby.runtime.load.LoadService.require(LoadService.java:392)	at org.jruby.RubyKernel.requireCommon(RubyKernel.java:944)	at org.jruby.RubyKernel.require19(RubyKernel.java:937)	at org.jruby.RubyKernel$INVOKER$s$1$0$require19.call(RubyKernel$INVOKER$s$1$0$require19.gen)	at org.jruby.internal.runtime.methods.JavaMethod$JavaMethodOneOrNBlock.call(JavaMethod.java:380)	at org.jruby.internal.runtime.methods.AliasMethod.call(AliasMethod.java:61)	at org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:313)	at org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:163)	at org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:316)	at org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:77)	at org.jruby.ir.interpreter.InterpreterEngine.interpret(InterpreterEngine.java:86)	at org.jruby.internal.runtime.methods.MixedModeIRMethod.INTERPRET_METHOD(MixedModeIRMethod.java:210)	at org.jruby.internal.runtime.methods.MixedModeIRMethod.call(MixedModeIRMethod.java:196)	at org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:197)	at org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:313)	at org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:163)