Between Mac and Window

My web application works well on Mac but displays this message on Window.
I only use a WebImage, WebHtml, WebLabel and WebText.

Could not execute returned javascript: textlabel is not defined
Source: var langdir = document.getElementsByTagName(‘body’)[0]; if(langdir) { langdir.removeAttribute(‘dir’); }
var langdir = document.getElementsByTagName(‘body’)[0]; if(langdir) { langdir.setAttribute(‘lang’,‘fr’); }
new imageview(‘MUWR69HY’,[]);
Xojo.controls[‘MUWR69HY’].setEnabled(true);
Xojo.input.install(Xojo.controls[‘MUWR69HY’].object());
new textlabel(‘DlGAU9QP’,[‘TextChanged’]);
Xojo.controls[‘DlGAU9QP’].setEnabled(true);
new textcontrol(‘M3FEcKr8’,[]);
Xojo.controls[‘M3FEcKr8’].setEnabled(true);
new frameworkObject(‘Tdxj6Gt9’,[]);
Xojo.controls[‘Tdxj6Gt9’].setEnabled(true);
new frameworkObject(‘WHzwkoCz’,[]);
Xojo.controls[‘WHzwkoCz’].setEnabled(true);
Xojo.view.showPage(‘WHzwkoCz’);
document.title = “123 Univers”;

Xojo.view.dismissLoader();

My application is installed on a Server MiniMac Maverick.
What could it be?

Alain Lortie