Fatal error: Uncaught TypeError: Unsupported operand types: string * int in /var/www/sigicov_sign/shared/graficos/pChart/pChart.class:1538 Stack trace: #0 /var/www/sigicov_sign/shared/graficos/Example11.php(39): pChart->drawCubicCurve() #1 {main} thrown in /var/www/sigicov_sign/shared/graficos/pChart/pChart.class on line 1538