Building of a custom board fails to build in Keil Studio. Error message is "internal error" and "build failed". Should that work, is there any more error information available?
A similar project builds locally with mbed-tools, no problem.
Repository with blinky and 2 custom boards is here:
https://github.com/tschulz3016/keilstudio-blinky-custom-boards.git
Boards are F405A, using a STM32F405 and
STM32F4DISCOVERY (using a STM32F407)