pxt-calliope/docs/device/error-codes.md

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# Error codes
Your @boardname@ may encounter a situation that prevents it from running your code. When this happens, a frowny face will appear on your @boardname@ screen (see picture) followed by an error number. These are called _panic_ codes. For a full list of these codes, what they mean and what you can do to resolve them visit the [micro:bit guide to error codes](https://microbit.org/guide/hardware/error-codes/).
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* **10** (`MICROBIT_I2C_LOCKUP`): the @boardname@'s I2C bus is not working
* **20** (`MICROBIT_OOM`): there is no free memory on the @boardname@
* **30** (`MICROBIT_HEAP_ERROR`): a problem in the heap space.
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* **40** (`MICROBIT_NULL_DEREFERENCE `): there was a NULL dereference, the @boardname@ tried to manage a invalid object pointer.
* **42** (`MICROBIT_SYSTEM_ERROR`): there's an error condition in the @boardname@ system software.
* **43** (`MICROBIT_NO_RADIO`): the @boardname@ can't enable the radio.
* **50** (`MICROBIT_HARDWARE_UNAVAILABLE_ACC`): an error occurred with the micro:bit's accelerometer component.
* **51** (`MICROBIT_HARDWARE_UNAVAILABLE_MAG`): an error occurred with the micro:bit's magnetometer component.
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* **98** (`MICROBIT_ASSERTION_FAILED`): assertion failed, the condition in an [assert](/reference/control/assert) was false.
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```sim
basic.showLeds(`
# . . . #
# # . # #
. . . . .
. # # # .
# . . . #
`)
```
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## See also
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[panic](/reference/control/panic), [assert](/reference/control/assert),