Hi @simonfourquier
1. Ensure that your MCU Xpress IDE has been updated to the latest version. You can download the latest version of MCUXpresso IDE from the NXP official website.
2. Check your project settings to ensure that the compiler and target device are configured correctly. In the MCU Xpress IDE, click on "Project" ->"Properties", then select "C/C++Build" ->"Settings" on the left side. In the "Tool Settings" tab on the right, check the settings in the "MCU Linker" section to ensure that the correct target device (lpc1769) is selected.
3. If the problem persists, try creating a new project and copying your source code files to the new project. This can sometimes solve some issues related to project settings.
Hope this will help you.
BR
Hang
