DrawTextExpression: Don't have environment!
GraphicsUtils:getWriterFormatNames:
  java.lang.reflect.InvocationTargetException
Warning:  unknown extension 'png' when writing image file 'foo.png'.  Image file will probably not render correctly.
The file formats supported for writing by your Java platform are: 
GraphicsUtils:getWriterFormatNames:
  java.lang.reflect.InvocationTargetException
.
To force writing to a file without a recognized extension, instead use the method:
   g.writeFormat["filename", "format" ... ]
      where "format" is one of the format strings listed above.
Could not construct suitable image renderer.