Custom Ant DataType errors

build.xml

<project name="datatypetest">
	
	<path id="classpath">
		<fileset dir="lib">
			<include name="**/*.jar" />
		</fileset>
		<pathelement location="cls" />
	</path>
	
	<target name="compile">
		<delete dir="cls" />
		<mkdir  dir="cls" />
		<javac srcdir="src" destdir="cls" classpathref="classpath" includeantruntime="false" fork="true" />
	</target>
	
	<target name="demotypetest">
		<typedef name="demotype" classname="types.DemoType" classpathref="classpath" />
		<taskdef name="customtask" classname="tasks.CustomTask" classpathref="classpath" />
		
		<demotype id="demotypeid" data="demotypedata" />
		<customtask demotyperef="demotypeid" />
	</target>

</project>

output

Buildfile: /Users/arjan/dev/so-test/build.xml
demotypetest:
 [demotype] types.DemoType :: setData :: demotypedata
[customtask] types.DemoType :: setRefid :: demotypeid

BUILD FAILED
C:\Users\300234875\Development\Java\datatypetest\build.xml:21: demotypeid doesn't denote a DemoType

Total time: 462 milliseconds

tasks.Customtask.java

package tasks;

import org.apache.tools.ant.Task;
import org.apache.tools.ant.types.Reference;

import types.DemoType;

public class CustomTask extends Task {

	private DemoType data;
	
	public void setDemotypeRef(Reference ref) {
		if(data == null) {
			data = new DemoType();
			data.setProject(getProject());
		}
		data.setRefid(ref);
	}
	
	public void execute() {
		System.out.println(data.getData());
	}
	
}

types.DemoType.java

package types;

import org.apache.tools.ant.types.DataType;
import org.apache.tools.ant.types.Reference;

public class DemoType extends DataType {

	private String data;
	
	protected DemoType getRef() {
		return (DemoType)getCheckedRef();
	}
	
	public void setRefid(Reference ref) {
		System.out.println(getClass().getName() + " :: setRefid :: " + ref.getRefId());
		super.setRefid(ref);
	}
	
	public String getData() {
		String ret;
		if(isReference()) {
			ret = getRef().getData();
		} else {
			ret = data;
		}
		System.out.println(getClass().getName() + " :: getData :: " + ret);
		return ret;
	}
	
	public void setData(String data) {
		System.out.println(getClass().getName() + " :: setData :: " + data);
		checkAttributesAllowed();
		this.data = data;
	}
	
	
	
}