[CentOS] problem of apt

Hi all !
Today the apt had a problem,here is the result:
[cjzjm100 at localhost ~]$ sudo apt-get install nautilus-sendtoPassword:/var/lib/apt/lists/mrepo_rhel5s-i386_RPMS.os_repodata_repomd.xml:1: parser error : Start tag expected, '<' not found  ^apt-get: rpm/rpmindexfile.cc：645：std::string rpmRepomdIndex::IndexURI(std::string) const: “Res.size() > 0”failed.gave up.


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