The page at x was not allowed to display insecure content...

I have the following page which is only accessibe for members of the site. There is an AMCharts Gauge on it showing a value dynamically. The Gauge is included via the HTML Component. With the postMessage() Method of the HTML component (#mfgfhours) i’m sending new Values to the gauge. This works perfectly in the preview mode. When i’m visiting the page on production i receive the error messages seen in the screenshot.


In the Page Code i have in the $w.onReady() function the following code:

$w("#mfgfhours").postMessage({"hours":1122});

What am i doing wrong?