Error When compiling

[soggycat]

Hi There

I seem to get the below error when trying to compile any help appreciated

~/process-pst (master ✘)✭ ᐅ make
[ 7%] Building CXX object CMakeFiles/ProcessPstLib.dir/edrm.cpp.o
/Users/gwest/process-pst/edrm.cpp: In function 'void::output_file(edrm_context&, const std::wstring&, const std::wstring&, const std::vector<unsigned char, std::allocator >&)':
/Users/gwest/process-pst/edrm.cpp:177: error: 'class boost::filesystem::path' has no member named 'file_string'
make[2]: *** [CMakeFiles/ProcessPstLib.dir/edrm.cpp.o] Error 1
make[1]: *** [CMakeFiles/ProcessPstLib.dir/all] Error 2
make: *** [all] Error 2