Eclipse中导入工程提示：invalid project description

在把jforum-2.1.8-src解压放到eclipse的工作空间导入到eclipse中时，提示invalid project description

查看jforum-2.1.8-src下的.project文件

<?xml version="1.0" encoding="UTF-8"?>
<projectDescription>
	<name>JForum</name>
	<comment></comment>
	<projects>
	</projects>
	<buildSpec>
		<buildCommand>
			<name>org.eclipse.jdt.core.javabuilder</name>
			<arguments>
			</arguments>
		</buildCommand>
	</buildSpec>
	<natures>
		<nature>org.eclipse.jdt.core.javanature</nature>
		<nature>com.sysdeo.eclipse.tomcat.tomcatnature</nature>
	</natures>
</projectDescription>

 项目描述名称是JForum, 把jforum-2.1.8-src文件夹名称改成JForum，再次导入项目则成功了