I am having problem deserializing from a file of a serialized object. An exception of input stream error always occurs. The class of the object is pasted [here](http://pastebin.com/6XEBybWV). The xml file is pasted [here](http://pastebin.com/e2Ka2kVH). I tried debugging the program. The top few frames of the back trace of the exception is as follows

#0  0x00007f8f9be4c267 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:55                                         #1  0x00007f8f9be4deca in __GI_abort () at abort.c:89                         #2  0x00007f8f9c76006d in __gnu_cxx::__verbose_terminate_handler() () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6                                       #3  0x00007f8f9c75dee6 in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6 #4  0x00007f8f9c75df31 in std::terminate() () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6                                                             #5  0x00007f8f9c75e149 in __cxa_throw () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6                                                             #6  0x00007f8f9e661734 in void boost::serialization::throw_exception<boost::archive::archive_exception>(boost::archive::archive_exception const&) () from /usr/lib/x86_64-linux-gnu/libboost_serialization.so.1.55.0     #7  0x00007f8f9e67e2f7 in boost::archive::basic_xml_iarchive<boost::archive::xml_iarchive>::load_start(char const*) () from /usr/lib/x86_64-linux-gnu/libboost_serialization.so.1.55.0     #8  0x0000000000486ab4 in boost::archive::basic_xml_iarchive<boost::archive::xml_iarchive>::load_override<std::map<int, std::deque<Observation, std::allocator<Observation> >, std::less<int>, std::allocator<std::pair<int const, std::deque<Observation, std::allocator<Observation> > > > > > (this=0x7ffe12327440, t=...)                                                                       at /usr/include/boost/archive/basic_xml_iarchive.hpp:85  

It seems the problem occurs when the std::map<int, std::deque<Observation, std::allocator<Observation> > in Status is loaded. I can't step into frame #7 to checkout the detail of the exception. Could anyone give a hint of the problem. Thanks!