E0562310:Undefined external symbol

Hi

i tried to implemnt the fit modul r_flash_rx to my projekt and the following compile error apears i dont know how to fix this.

 E0562310:Undefined external symbol "_R_FLASH_Open" referenced in ".\src\cg_src\r_cg_main.obj"

i am working with e2 Studio RX113 and Renesas Toolchain

thx for help if you can.