Print QWebView to PDF

I want to print a QWebView to PDF and save it to my desktop. I have implemented a function for this and here is the code:

// Print to PDF
// Purpose: print incoming HTML source code to a PDF on the users desktop
// Input:   string containing the HTML source code, string with the desired filename of resulting PDF
// Output:  void
void MainWindow::printToPDF(QString htmlinput, QString filename)
{
    // Set location of resulting PDF
    QString saveLocation = QStandardPaths::writableLocation(QStandardPaths::DesktopLocation) + "/" + filename + ".pdf";

    // Initialize printer and set save location
    QPrinter printer(QPrinter::HighResolution);
    printer.setOutputFileName(saveLocation);

    // Create webview and load html source
    QWebView webview;
    webview.setHtml(htmlinput);

    // Create PDF
    webview.print(&printer);
}

      

        
        
        
      

    

Now my problem is that I am getting the following error in my application:

QPainter::begin(): Returned false

      

        
        
        
      

    

I confirm this error is caused by the above function, on the other hand, I have tried the above code only in another project to confirm that it works - what it does.

Any suggestions?