Regular and bold font in the same text field of flash template

i have tried to do this and i get error

[error]<invoke name="OnError" returntype="xml"><arguments><string>@Add@1@TypeError: Error #1010@</string></arguments></invoke>

my AS code is:

package
{
	import caurina.transitions.Equations;
	import caurina.transitions.Tweener;
	import flash.display.Loader;
	import flash.display.MovieClip;
	import flash.events.Event;
	import flash.events.TimerEvent;
	import flash.net.URLRequest;
	import flash.text.TextField;
	import flash.utils.Timer;
	import flash.geom.ColorTransform;
	import se.svt.caspar.ICommunicationManager;
	import se.svt.caspar.IRegisteredDataSharer;
	import se.svt.caspar.template.CasparTemplate;


	
	public class vs_lt extends CasparTemplate
	{
		
		
		private const customParameterDescription:XML =
		<parameters>
		<parameter id="logo1" type="string" info="URL slike 1" />
		<parameter id="logo2" type="string" info="URL slike 2" />
		<parameter id="html" type="string" info="html" />
		</parameters>;
					
		
		
		override public function SetData(xmlData:XML):void 
		{
			
			
			
			for each (var element:XML in xmlData.children())
			{
				
				if (element.@id == "logo1") 		
				{	
					tekst.tim1.source = element.data.@value.toString();
				}
				if (element.@id == "logo2") 		
				{	
					tekst.tim2.source = element.data.@value.toString();
				}
				if (element.@id == "html") 		
				{	
					tekst.vs.htmlText = element.data.@value.toString();
				}
				
			}

			
			super.SetData(xmlData):void;
			
			
		}
	}
}

html var that i send from my C# app is:

<font face="Font 1">Name </font> <font face="Font 2" > Surname</font>

Font 1 and Font 2 are embeded names in Animate 19