你好 teaching-plan报错什么原因？

<?xml version="1.0" encoding="UTF-8"?>
<teaching-plan xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  xsi:noNamespaceSchemaLocation="teaching-plan2.xsd">
	<course id="1">
		<course-name>英语</course-name>
		<course-hour>36</course-hour>
		<exam-form>考试</exam-form>
	</course>
	<course id="2">
		<course-name>高等数学</course-name>
		<course-hour>70</course-hour>
		<exam-form>考试</exam-form>
	</course>
	<course id="3">
		<course-name>计算机应用基础</course-name>
		<course-hour>108</course-hour>
		<exam-form>上机考试</exam-form>
	</course>
</teaching-plan>




<?xml version="1.0" encoding="UTF-8"?>
<schema xmlns="http://www.w3.org/2001/XMLSchema" >
<element name="teaching-plan">
	<complexType>
		<sequence>
			<element name="course" minOccurs="1"  maxOccurs="100" >
				<complexType>
					<sequence>
						<element name="course-name" type="string"></element>
						<element name="course-hour" type="integer" minOccurs="20" maxOccurs="110"></element>
						<element name="exam-form" type="string"></element>
					</sequence>
					<attribute name="id" type="string" use="required"></attribute>
				</complexType>
			</element>
		</sequence>
	</complexType>
</element>
</schema>