Roger Hicks

I have developed a website (www.rookeries.uk) incorporating pchart. This have been live now for 18-months. A recent upgrade of PHP (from 7.0 to 7.2) has resulted in the pcharts not being rendered and a blank page being displayed. If i remove the pchart from a page, the page is correctly displayed (minus the chart). I used Netbeans to develop the website and the charts are still displayed in this environment. What do I need to change to get pchart to work with PHP 7.2. Thanks Roger Hicks