No graph from RRD data

Dump from usage.rrd:
<!-- Round Robin Database Dump -->
<rrd>
        <version> 0001 </version>
        <step> 300 </step> <!-- Seconds -->
        <lastupdate> 1164183687 </lastupdate> <!-- 

2006-11-22 09:21:27
CET

-->

        <ds>
                <name> usage </name>
                <type> DERIVE </type>
                <minimal_heartbeat> 600 </minimal_heartbeat>
                <min> 0.0000000000e+00 </min>
                <max> NaN </max>

                <!-- PDP Status -->
                <last_ds> 1 </last_ds>
                <value> 0.0000000000e+00 </value>
                <unknown_sec> 0 </unknown_sec>
        </ds>

hobbitgraph.cfg is configured:
[usage]
        TITLE Usage
        YAXIS # Users
        DEF:u=usage.rrd:usage:AVERAGE
        COMMENT:\n
        GPRINT:u:LAST: \: %5.1lf (cur)
        GPRINT:u:MAX: \: %5.1lf (max)
        GPRINT:u:MIN: \: %5.1lf (min)
        GPRINT:u:AVERAGE: \: %5.1lf (avg)\n

You have no LINE defined. 
Insert something like LINE2:u#FF0000:Users

Oke thanks, inserted LINE in hobbitgraph.cfg
Still, not even a graph is presented on status page from test.