Hi @Stephen, the link above isn't working, and I am facing the same error 230 today, in 2017.

It's been a few years since I used mbed online compiler and I'm coming back to try out mbed OS. I'm following the tutorial here: https://os.mbed.com/docs/v5.6/tutorials/blinky-on-the-arm-mbed-online-compiler.html#selecting-a-target-board I've imported mbed-os-example-blinky, and tried a compile and I also get the error 230, full error mesage is:

"Error: The build system did not finish successfully." and error number -230, clicking the help button states:

"Compiler Error 230 Syntax error(s) in Assembly."

I've tried a few targets, all have the same issue including: NUCLEO-F303K8 mbed NXP LPC2368

What causes the issue and how can it be worked around?

Thanks! Neil.

The compiler is reporting an error because the Mbed OS 5 blinky example (mbed-os-example-blinky) does not fit in the targets you have tried due to memory resource constraints. The alternative would be to use Mbed OS 2 which is a modular light weight library for Mbed APIs https://os.mbed.com/users/mbed_official/code/mbed_blinky/ . It is for the same reason that NUCLEO-F303K8 is listed as Mbed SO 2 compatible only in the platforms page https://os.mbed.com/platforms/ST-Nucleo-F303K8/ .

I found this "solution" by doing a search, but I ran into the same cryptic error 230 message and had no idea what it meant. I agree with other posters that this puts a very bad taste in my mouth, as someone looking to use the OS. I would recommend updating the message given by the online compiler, or at least the message given on the page that it links to. In addition, the platforms/boards page (https://os.mbed.com/platforms/?) could use a much better explanation of the differences between "Mbed Enabled" and "Mbed support". In addition to that, I can't find any kind of "system requirements" for any version of the OS that easily tells me the minimum SRAM and FLASH required.