Today I ran into this error: Base class package “Tree::DAG_Node” is empty. (Perhaps you need to ‘use’ the module which defines that package first.) at /usr/lib/perl5/vendor_perl/5.8.8/XML/Validator/Schema/Node.pm line 2 An odd error from perl’s XML Validation libraries; here is how you fix it: install the Tree::DAG_Node package yum -y install perl-DAG_Node
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