Tile_map for MapViz not showing

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Hi everyone!

I recently started using MapViz and everything is working fine, but I am not able to use the tile_map plugin. I can add it and it says "OK" but no map is displayed. My launch-file looks something like this:

<launch>
<node pkg="tf" type="static_transform_publisher" name="swri_transform" args="0 0 0 0 0 0 /map /base_link 100"  />

<node pkg="swri_transform_util" type="initialize_origin.py" name="initialize_origin" >
    <param name="local_xy_frame" value="/map"/>
    <param name="local_xy_origin" value="Bar"/>
    <rosparam param="local_xy_origins">
        [{ name: Bar,
         latitude: 37.9879772,
         longitude: 23.9078602,
         altitude: 129.69,
         heading: 0.0}]
    </rosparam>
</node>

<node pkg="mapviz" type="mapviz" name="mapviz"/>

</launch> In MapViz my fixed frame is set to map and the target frame is set to base_link. Does anyone know how to solve this? Thanks!