Can't build STM32F746 + LWIP project

[MEsco]

I created a project for using the STM32F746 DISCOVERY board with LwIP utility (see image 1 and 2 ). As soon as the project was created i tried to build it but ended up not beeing able to do so and getting the following error(see image 3):

Hope someone can help to deal with this. 

Thanks.

[Piranha]

The first error says very clearly what is the problem. Maybe try actually reading it...

[MEsco]

Hi piranha,

My problem is that the file is in the correct folder but i do not understand why this error is appearing. Also why there is a problem with a third party library given by Stm