I am using the latest Mbed Studio 1.4.0 to compile a project. The project was compiled fine with my custom project. But it fails to compile with 1.4.0 from GUI.
When I tried to do it in terminal:
mbed compile -m myTarget -t ARMC6
My project is compiled fine.
So I believe the issue is in ‘Manage Custom Targets’. You cannot choose your ‘Custom target’. Whatever you choose it, it can only go to the target in ‘targets.json’, not the target in ‘custom_targets.json’.