Fatal error: Uncaught TypeError: Unsupported operand types: float * string in /var/www/sigicov_sign/shared/graficos/pChart/pChart.class:1535 Stack trace: #0 /var/www/sigicov_sign/shared/graficos/Example19.php(36): pChart->drawCubicCurve() #1 {main} thrown in /var/www/sigicov_sign/shared/graficos/pChart/pChart.class on line 1535