Fixing for complex IO

src/VTKWriter/VTKWriter_grids_util.hpp

@@ -1014,6 +1014,9 @@ struct meta_prop_new<I,ele_g,St,T,false>
 	inline meta_prop_new(const openfpm::vector< ele_g > & vg, std::string & v_out, const openfpm::vector<std::string> & prop_names, file_type ft)
 	{
 	}
+
+    static inline void get_pvtp_out(std::string & v_out, const openfpm::vector<std::string> & prop_names)
+    {}
 };
 
 template<unsigned int dims,typename T> inline void output_point(Point<dims,T> & p,std::stringstream & v_out, file_type ft)