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<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /srv/http/sp-weigher/spw_hopper_graph.php:31) in <b>/srv/http/sp-weigher/phpgraphlib.php</b> on line <b>215</b><br />
<br />
<b>Fatal error</b>:  Uncaught TypeError: Unsupported operand types: string - string in /srv/http/sp-weigher/phpgraphlib.php:1006
Stack trace:
#0 /srv/http/sp-weigher/spw_hopper_graph.php(35): PHPGraphLib-&gt;addData()
#1 {main}
  thrown in <b>/srv/http/sp-weigher/phpgraphlib.php</b> on line <b>1006</b><br />