Tools versions: TESSY v4.2.8 TrueSTUDIO for STM32 9.0.1 Hardware: Prozessor: STM32L031K6T6 (ARM Cortex-M0+) Board: STM32L031 Nucleo-32 Interface: Micro USB B Important hint: All you need to set for this example project is TEE attribute "TrueStudio Install Path", which you will find in the project's compiler node at the bottom of the attributes list.