Unstable working of JigAdmin

I have 2 questions:

1. While starting Jigsaw I retrieve this output:

loading properties from: g:\jigsaw\jigsaw\config\server.props
Jigsaw[2.0.2]: serving at http://satellite.kiev.ua:8001/
*** Warning : no logger specified, not logging.
JigAdmin[2.0.2]: serving at http://satellite.kiev.ua:8009/

All works fine. But warning message! What does it mean?

2. After 5-10 min JigAdmin returns error "Unable to contact target
server localhost:8009 after 3 tries" and exception occurred during
event dispatching:

java.lang.NullPointerException
        at org.w3c.tools.resources.AttributeHolder.getValue(Compiled
Code)
        at org.w3c.tools.resources.Resource.getValue(Compiled Code)
        at org.w3c.tools.resources.Resource.getContext(Compiled Code)
        at org.w3c.tools.resources.Resource.getSpace(Compiled Code)
        at org.w3c.tools.resources.Resource.markModified(Compiled
Code)
        at
org.w3c.tools.resources.FramedResource.markModified(Compiled Code)
        at
org.w3c.tools.resources.FramedResource.frameModified(Compiled Code)
        at
org.w3c.tools.resources.ResourceFrame.fireFrameEvent(Compiled Code)
        at org.w3c.tools.resources.ResourceFrame.processEvent(Compiled
Code)
        at org.w3c.tools.resources.event.Dispatcher.run(Compiled Code)

What does it mean?

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