ImportXML with Google Sheet and Auto Refresh Every Minute

I have the script below which is importing some XML data in a google sheet called prices. Everything works fine except that I have set up a time driven trigger to run every minute but the data won't get updated.

• The trigger seems to work fine, as I can see the last run time being updated every minute.
• The script calling the XML data works fine as I can see the data being populated in the spreadsheet.
• The XML feed works fine too, as I can see the time being updated every minute, also have a cron job.

• I only have this function as a project.

  function getData() {  var sheetName = SpreadsheetApp.getActiveSpreadsheet().getSheetByName("prices");  var queryString = Math.random();  var cellFunction = '=ImportXML("http://myxmldata.com/data-xml.php","//data/date")';  sheetName.getRange('A2').setValue(cellFunction);} 

  So what's wrong?