Thread: noClassDefFoundError trying to run JNLP file with Web Start

I am attempting to run a swing application on my site; I created the jar with my class file as its sole member, and wrote the JNLP file below. But when I try to run the JNLP with Web Start either from the browser or my desktop, I keep getting this error which I've shown under the JNLP code. I am new at this so can anyone tell if I am making any obvious errors?

<?xml version="1.0" encoding="utf-8"?>
<!- JNLP File for the PageData Application ->
<jnlp
	codebase="---------------"
	href="PageData.jnlp">
	<information>
		<title>PageData Application</title>
		<vendor>Me</vendor>
		<homepage href="----------------"/>
		<icon href="pagedataicon.gif"/>
		<offline-allowed/>
	</information>
	<resources>
		<j2se version="1.7"/>
		<jar href="PageData.jar" main="true"/>
	</resources>
	<security>
		<all-permissions/>
	</security>
	<application-desc main-class="PageData"/>
</jnlp>

java.lang.NoClassDefFoundError: PageData (wrong name: PageData/PageData)
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(Unknown Source)
	at java.security.SecureClassLoader.defineClass(Unknown Source)
	at java.net.URLClassLoader.defineClass(Unknown Source)
	at java.net.URLClassLoader.access$100(Unknown Source)
	at java.net.URLClassLoader$1.run(Unknown Source)
	at java.net.URLClassLoader$1.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(Unknown Source)
	at com.sun.jnlp.JNLPClassLoader.findClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at com.sun.javaws.Launcher.doLaunchApp(Unknown Source)
	at com.sun.javaws.Launcher.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)