@EdwinHz
I manualy enter the PATH in project -> properties -> C/C++ Build -> Environment. That seems to help because the first error is gone.
Now I have another problem when trying to build:

You see in the "Project Explorer" that the MCU is chip JN5189. But when you look at the "Problems" tab in the middel/under you see that the used SDKpackage for this project is K32W061. But I have the JN5189DK6 package.
Therefore I edited the Makefile and selected the correct chip.
Another try to build gives me an Error 2. Look at the Screenshot below in the "Problems" tab middle/under.

What do you suggest to do now? I've added the the Build Log as an attachment.