eclipse中tomcat操作报错：不允许有匹配 "[xX][mM][lL]" 的处理指令目标

An error occurred while cleaning Tomcat v7.0 Server at localhost work directory.
Could not load the Tomcat server configuration at \Servers\Tomcat v7.0 Server at localhost-config. The configuration may be corrupt or incomplete.

不允许有匹配 "[xX][mM][lL]" 的处理指令目标。

解决方法：

打开tomca配置文件下的server.xml文件，检查头部：<?xml version="1.0" encoding="UTF-8"?>，这里是否多出一个空格，去掉空格即可。