System Workbench for STM32

Hi,

I`m trying to create my own static library project and when i compile i am getting this messages:

Description Resource Path Location Type

1. error "Please select first the target STM32F4xx device used in your application (in stm32f4xx.h file)" stm32f4xx.h /stm32f4discovery_hal_lib/CMSIS/device line 173 C/C++ Problem

I have created a new library project, using external librarys (HAL libraries), i have added my library files (.h files and .c files), and tryed to compile the project, but i can´t compile the project.

Any help would be really helpfull, thanks.