data flash problem

The data flash library is enable, and that function is use in project setting.

After adding those files of PFDL library into my project, it shows;

E0562310:Undefined external symbol "_PFDL_Open" referenced in ".\src\r_cg_pfdl.obj"
E0562310:Undefined external symbol "_PFDL_Handler" referenced in ".\src\r_cg_pfdl.obj"
E0562310:Undefined external symbol "_PFDL_Execute" referenced in ".\src\r_cg_pfdl.obj"
E0562310:Undefined external symbol "_PFDL_Close" referenced in ".\src\r_cg_pfdl.obj"

and above 4 functions could not be found. How to solve it ?