Compiler internal error

The online compiler won’t get past “preparing…” or states a “internal error” even on code that has been working before……

Update: The Online Compiler build service is now back up and running thanks to @SamCHogg. You should find that your projects compile again. For those of you who’ve lost source code, we’ll try to preserve our backups until Monday.

Apologies again for the disruption!


All builds are failing using the Online Compiler as of Friday night (UK time). We’re not likely to have it fixed until Monday unfortunately.

Apologies for the timing of this, and appreciate that it’s frustrating.

If your work is urgent, then we have Mbed Studio and Mbed CLI as a workaround. The newest version of Mbed Studio, which you can download from also ships Mbed CLI and other command line tools that you can access through the terminal. N.B. Mbed OS 5.12+ is supported due to the compiler we ship with Studio.

Kind regards,

me too. is this server wrong?