Hi, 
I  imitate the example in the tests folder:wms_jpl_landsat.earth.
The source code:
<!--
osgEarth Sample
This example pulls imagery and dems from an online VirtualPlanetBuilder 
generated database.
-->
<map name="Virtual Planet Builder model" type="geocentric" version="2">


    <image name="imagery layer 0" driver="vpb">
        <url>http://www.openscenegraph.org/data/earth_bayarea/earth.ive</url>
        <primary_split_level>5</primary_split_level>
        <secondary_split_level>11</secondary_split_level>
    </image>
    <heightfield name="dem" driver="vpb">
      <url>http://www.openscenegraph.org/data/earth_bayarea/earth.ive</url>
      </heightfield>
    <options>
        <lighting>false</lighting>
        <cache_policy usage="no_cache"/>
    </options>
</map>





My code:

<!--
osgEarth Sample
This example pulls imagery and dems from an online VirtualPlanetBuilder 
generated database.
-->
<map name="Virtual Planet Builder model" type="geocentric" version="2">


    <image name="imagery layer 0" driver="vpb">
        <url>D:/3D/my.ive</url>                                                 
                 <!-- change -->
        <primary_split_level>5</primary_split_level>
        <secondary_split_level>11</secondary_split_level>
    </image>
    <heightfield name="dem" driver="vpb">
      <url> D:/3D/my.ive </url>                                                 
               <!-- change -->
      </heightfield>
    <options>
        <lighting>false</lighting>
        <cache_policy usage="no_cache"/>
    </options>
</map>


Why my ecode is wrong??
thanks!
makn
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