[ERROR] WARNING: Service exception while executing org.jason.mapmaker.shared.act
ion.feature.ImportSingleFeatureAction: Service exception executing action "Impor
tSingleFeatureAction", java.lang.NullPointerException
[ERROR] com.gwtplatform.dispatch.shared.ServiceException: Service exception exec
uting action "ImportSingleFeatureAction", java.lang.NullPointerException
[ERROR]         at com.gwtplatform.dispatch.shared.ServiceException_FieldSeriali
zer.instantiate(ServiceException_FieldSerializer.java:16)
[ERROR]         at com.gwtplatform.dispatch.shared.ServiceException_FieldSeriali
zer.create(ServiceException_FieldSerializer.java:25)
[ERROR]         at com.google.gwt.user.client.rpc.impl.SerializerBase.instantiat
e(SerializerBase.java:115)
[ERROR]         at com.google.gwt.user.client.rpc.impl.ClientSerializationStream
Reader.deserialize(ClientSerializationStreamReader.java:111)
[ERROR]         at com.google.gwt.user.client.rpc.impl.AbstractSerializationStre
amReader.readObject(AbstractSerializationStreamReader.java:119)
[ERROR]         at com.google.gwt.user.client.rpc.impl.RequestCallbackAdapter.on
ResponseReceived(RequestCallbackAdapter.java:216)
[ERROR]         at com.google.gwt.http.client.Request.fireOnResponseReceived(Req
uest.java:287)
[ERROR]         at com.google.gwt.http.client.RequestBuilder$1.onReadyStateChang
e(RequestBuilder.java:395)
[ERROR]         at sun.reflect.GeneratedMethodAccessor36.invoke(Unknown Source)
[ERROR]         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMet
hodAccessorImpl.java:25)
[ERROR]         at java.lang.reflect.Method.invoke(Method.java:597)
[ERROR]         at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.j
ava:103)
[ERROR]         at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch
.java:71)
[ERROR]         at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSess
ionHandler.java:167)
[ERROR]         at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages
WhileWaitingForReturn(BrowserChannelServer.java:326)
[ERROR]         at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascrip
t(BrowserChannelServer.java:207)
[ERROR]         at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpac
eOOPHM.java:132)
[ERROR]         at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace
.java:561)
[ERROR]         at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(Modul
eSpace.java:269)
[ERROR]         at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(Ja
vaScriptHost.java:91)
[ERROR]         at com.google.gwt.core.client.impl.Impl.apply(Impl.java)
[ERROR]         at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:214)
[ERROR]         at sun.reflect.GeneratedMethodAccessor34.invoke(Unknown Source)
[ERROR]         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMet
hodAccessorImpl.java:25)
[ERROR]         at java.lang.reflect.Method.invoke(Method.java:597)
[ERROR]         at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.j
ava:103)
[ERROR]         at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch
.java:71)
[ERROR]         at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSess
ionHandler.java:167)
[ERROR]         at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages
(BrowserChannelServer.java:281)
[ERROR]         at com.google.gwt.dev.shell.BrowserChannelServer.processConnecti
on(BrowserChannelServer.java:531)
[ERROR]         at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChan
nelServer.java:352)
[ERROR]         at java.lang.Thread.run(Thread.java:662)