QTI 1.2: illegal character block result XSLT transformation

2019-03-08 10:41:31,964 [ajp-nio2-8006-exec-492] ERROR LocalizedXSLTransformer - OLAT::ERROR ^%^ N1-E62827 ^%^ org.olat.ims.qti.render 

https://olat.xyz.ch/auth/1%3A88%3A1020162414%3A1%3A0%3Acid%3Asitse/
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101 Firefox/45.0

**RedScreen** Error transforming XML.
<dispatchinfo>
	<componentinfo>
		<compname>olatmodiqrun</compname>
		<compclass>org.olat.core.gui.components.velocity.VelocityContainer</compclass>
		<extendedinfo>page:org/olat/modules/iq/_content/qti.html</extendedinfo>
		<event>
			<class&gt;org.olat.core.gui.control.Event</class&gt;
			<command>sas</command>
			<tostring>com:sas,org.olat.core.gui.control.Event@1bc04</tostring>
		</event>
	</componentinfo>
	<controllerinfo>
		<controllername>org.olat.modules.iq.IQDisplayController</controllername>
		<controllername>org.olat.course.nodes.iq.IQRunController</controllername>
		<controllername>org.olat.course.run.RunMainController</controllername>
		<controllername>org.olat.course.run.CourseRuntimeController</controllername>
		<controllername>org.olat.core.commons.fullWebApp.BaseFullWebappController</controllername>
	</controllerinfo>
</dispatchinfo>

>>> stack of 1.cause::org.olat.core.logging.OLATRuntimeException: Error transforming XML.
-> at org.olat.ims.qti.render.LocalizedXSLTransformer.render(LocalizedXSLTransformer.java:156)
   at org.olat.ims.qti.render.LocalizedXSLTransformer.renderResults(LocalizedXSLTransformer.java:167)
   at org.olat.modules.iq.IQManager.transformResultsReporting(IQManager.java:267)
   at org.olat.modules.iq.IQDisplayController.generateDetailsResults(IQDisplayController.java:612)
   at org.olat.modules.iq.IQDisplayController.postSubmitAssessment(IQDisplayController.java:596)
   at org.olat.modules.iq.IQDisplayController.event(IQDisplayController.java:529)
   at org.olat.core.gui.control.DefaultController.dispatchEvent(DefaultController.java:202)
   at org.olat.core.gui.components.AbstractComponent$1.run(AbstractComponent.java:240)
   at org.olat.core.logging.activity.ThreadLocalUserActivityLoggerInstaller.runWithUserActivityLogger(ThreadLocalUserActivityLoggerInstaller.java:108)
   at org.olat.core.gui.components.AbstractComponent.fireEvent(AbstractComponent.java:238)
   at org.olat.core.gui.components.velocity.VelocityContainer.doDispatchRequest(VelocityContainer.java:114)
>>> stack of 2.cause::net.sf.saxon.trans.XPathException: Illegal HTML character: decimal 129
-> at net.sf.saxon.event.HTMLEmitter.writeEscape(HTMLEmitter.java:344)
   at net.sf.saxon.event.XMLEmitter.characters(XMLEmitter.java:560)
   at net.sf.saxon.event.HTMLEmitter.characters(HTMLEmitter.java:453)
   at net.sf.saxon.event.HTMLIndenter.characters(HTMLIndenter.java:178)
   at net.sf.saxon.event.ProxyReceiver.characters(ProxyReceiver.java:182)
   at net.sf.saxon.event.ProxyReceiver.characters(ProxyReceiver.java:182)
   at net.sf.saxon.event.ProxyReceiver.characters(ProxyReceiver.java:182)
   at net.sf.saxon.event.ComplexContentOutputter.characters(ComplexContentOutputter.java:159)
   at net.sf.saxon.instruct.ValueOf.processLeavingTail(ValueOf.java:245)
   at net.sf.saxon.instruct.Block.processLeavingTail(Block.java:556)
   at net.sf.saxon.instruct.Choose.processLeavingTail(Choose.java:686)