E0562310:Undefined external symbol

hi all,

we are tried to implement the internal flash program, FSl library included in to work space the following compile error appears i dont know how to fix this.

E0562310: Undefined external symbol "_FSL_Init" referenced in ".\src\r_main.obj" CC_Rl_FlashTest C/C++ Problem

we are working with e2 Studio cc_rl compiler. 

thx for help if you can.