please post the full message, we missed the first line?

As requested: This is the whole log I see.

#0 Piwik_ErrorHandler(...) called at [:]<br />
#1 imagedestroy(...) called at [/home2/element/public_html/analytics/libs/pChart2.1.3/class/pDraw.class.php:1277]<br />
#2 pDraw->drawFromPicture(...) called at [/home2/element/public_html/analytics/libs/pChart2.1.3/class/pDraw.class.php:1209]<br />
#3 pDraw->drawFromPNG(...) called at [/home2/element/public_html/analytics/libs/pChart2.1.3/class/pDraw.class.php:1691]<br />
#4 pDraw->drawLegend(...) called at [/home2/element/public_html/analytics/plugins/ImageGraph/StaticGraph/GridGraph.php:308]<br />
#5 Piwik_ImageGraph_StaticGraph_GridGraph->initGridChart(...) called at [/home2/element/public_html/analytics/plugins/ImageGraph/StaticGraph/Evolution.php:28]<br />
#6 Piwik_ImageGraph_StaticGraph_Evolution->renderGraph(...) called at [/home2/element/public_html/analytics/plugins/ImageGraph/API.php:477]<br />
#7 Piwik_ImageGraph_API->get(...) called at [:]<br />
#8 call_user_func_array(...) called at [/home2/element/public_html/analytics/core/API/Proxy.php:188]<br />
#9 Piwik_API_Proxy->call(...) called at [/home2/element/public_html/analytics/core/API/Request.php:145]<br />
#10 Piwik_API_Request->process(...) called at [/home2/element/public_html/analytics/plugins/API/Controller.php:25]<br />
#11 Piwik_API_Controller->index(...) called at [:]<br />
#12 call_user_func_array(...) called at [/home2/element/public_html/analytics/core/FrontController.php:125]<br />
#13 Piwik_FrontController->dispatch(...) called at [/home2/element/public_html/analytics/index.php:47]</div><br />
</pre></div><br />
<div style='word-wrap: break-word; border: 3px solid red; padding:4px; width:70%; background-color:#FFFF96;'>
<strong>There is an error. Please report the message (Piwik 1.12)
and full backtrace in the <a href='?module=Proxy&action=redirect&url=http://forum.piwik.org' target='_blank'>Piwik forums</a> (please do a Search first as it might have been reported already!).<br /><br/>
Warning:</strong> <i>Cannot modify header information - headers already sent by (output started at /home2/element/public_html/analytics/libs/Zend/Log/Writer/Stream.php:133)</i> in <b>/home2/element/public_html/analytics/libs/pChart2.1.3/class/pImage.class.php</b> on line <b>166</b>
<br /><br />Backtrace --><div style="font-family:Courier;font-size:10pt"><br />

Why is this thread closed? Problem is still there....

again you forgot the first line or removed too much info, please post full message from log

Moving 1.x closed tickets to 2.0