see  drawLineTo (http://fr2.php.net/manual/en/function.swfshape.drawlineto.php) to get more help with this error
SWFShape->drawLineDescriptionvoid swfshape->drawline ( int dx, int dy )
 swfshape->drawline() draws a line (using the current line style set by swfshape->setline()) from the current pen position to displacement (dx,dy). See also swfshape->movepento(), swfshape->drawcurveto(), swfshape->movepen() and swfshape->drawlineto(). 
  lexmanspam at laposte dot net 
 
 27-Jul-2005 03:07 
see  drawLineTo (http://fr2.php.net/manual/en/function.swfshape.drawlineto.php) to get more help with this error
  robert at peakepro dot com 
 
 16-May-2004 02:28 
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  dsward at webnation dot com 
 
04-Dec-2002 03:37 
If you receive a failed assertion error when using Ming's DrawLine function, try splitting the line into two or more smaller segments.
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