Hi I started getting the warning in Title. It used to work but now it does not work anymore :( Any tips would be greatly appreciated! Here is a jsfiddle. When hovering mouse over one of the two dots, the error is triggered from line 204 in the JS. It should display an image: https://jsfiddle.net/yngtp9xv/
tooltip: {
useHTML: true,
borderWidth: 0,
shadow: false,
formatter: function() {
return '<img src="./Earthmap.jpg" width="180" height="90" />'
},