eclips 编译时出现 Java compiler level does not match the version of installed project facet 错误

今天在编译项目时突然出现 Java compiler level does not match the version of the installed Java project facet. flower Unknown Faceted Project Problem (Java Version Mismatch) 的错误提示。尝试从SVN服务器重新update 整个项目,编译,还是报同样的错误
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