Using classes and objects

I have been implementing BFS but I run into the following errors while using lists, queues and objects:
Error 4 error C2784: 'bool std::operator <(const std::_Tree<_Traits> &,const std::_Tree<_Traits> &)' : could not deduce template argument for 'const std::_Tree<_Traits> &' from 'const Node' c:\program files\microsoft visual studio 8\vc\include\functional 143
Error 5 error C2784: 'bool std::operator <(const std::basic_string<_Elem,_Traits,_Alloc> &,const _Elem *)' : could not deduce template argument for 'const std::basic_string<_Elem,_Traits,_Alloc> &' from 'const Node' c:\program files\microsoft visual studio 8\vc\include\functional 143
Could anyone give me some advice what should I look for, cause I have no ideas..
Thank you!
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