87 lines
4.0 KiB
Markdown
87 lines
4.0 KiB
Markdown
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# Error codes
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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.
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```sim
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basic.forever(function() {
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basic.showLeds(`
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# . . . #
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# # . # #
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. . . . .
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. # # # .
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# . . . #
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`)
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basic.pause(1000)
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basic.clearScreen()
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basic.showString("020")
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})
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```
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## Board system errors
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The @boardname@ system errors range between **01** - **99**. 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://support.microbit.org/en/support/solutions/articles/19000016969).
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* **10** (`MICROBIT_I2C_LOCKUP`): the @boardname@'s I2C bus is not working
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* **20** (`MICROBIT_OOM`): there is no free memory on the @boardname@
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* **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
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* **42** (`MICROBIT_SYSTEM_ERROR`): there's an error condition in the @boardname@ system software
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* **43** (`MICROBIT_NO_RADIO`): the @boardname@ can't enable the radio
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* **50** (`MICROBIT_HARDWARE_UNAVAILABLE_ACC`): an error occurred with the micro:bit's accelerometer component
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* **51** (`MICROBIT_HARDWARE_UNAVAILABLE_MAG`): an error occurred with the micro:bit's magnetometer component
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* **90** (`MICROBIT_HARDWARE_CONFIGURATION_ERROR`): actual board hardware doesn't match the configuration description
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* **98** (`MICROBIT_ASSERTION_FAILED`): assertion failed, the condition in an [assert](/reference/control/assert) was false
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## Memory errors
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Memory error codes range from **800** - **909**.
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### ~alert
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#### Report errors!
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If you ever see an error within the range of **800** - **909**, please report an issue at [GitHub](https://github.com/microsoft/pxt-microbit/issues) or on the [support](https://support.microbit.org/) page.
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### ~
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### Garbage collector errors
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Error codes generated from the garbage collector.
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* **840**: Allocation pointer is null or invalid
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* **841**: Garbage collection work queue error
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* **843**: VTable entry is not free
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* **844**: GC allocation failed for requested number of bytes
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* **846**: Invalid allocation thread
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* **848**: Allocation pointer beyond allocation header
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* **849**: Allocation pointer is null
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### Program access errors
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* **901** (`PANIC_INVALID_BINARY_HEADER`): the type header for the object is not valid
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* **902** (`PANIC_OUT_OF_BOUNDS`): the object data portion is greater than the length defined for it
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* **903** (`PANIC_REF_DELETED`): an object reference was deleted and the object is no longer valid
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* **904** (`PANIC_SIZE`): the object size doesn't match the size defined for the type
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* **905** (`PANIC_INVALID_VTABLE`): an object vtable is invalid or not initialized
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* **906** (`PANIC_INTERNAL_ERROR`): an internal resource error
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* **907** (`PANIC_NO_SUCH_CONFIG`): the specified device resource is not present
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* **909** (`PANIC_INVALID_ARGUMENT`): the argument value is out of range or the type or format is invalid
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## JavaScript runtime codes
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### Invalid cast codes
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When the static type of ``x`` is a class ``C``, the dynamic type of ``x`` isn’t ``C``, and you try to access a field on ``x`` or call a method on ``x``, you will get one of the following codes, depending on dynamic type of ``x``.
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* **980** (`PANIC_CAST_FROM_UNDEFINED`): when value of ``x`` is ``undefined``
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* **981** (`PANIC_CAST_FROM_BOOLEAN`): when value of ``x`` is ``true`` or ``false``
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* **982** (`PANIC_CAST_FROM_NUMBER`): when ``x`` is a ``number``
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* **983** (`PANIC_CAST_FROM_STRING`): when ``x`` is a ``string``
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* **984** (`PANIC_CAST_FROM_OBJECT`): when ``x`` is object of some type
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* **985** (`PANIC_CAST_FROM_FUNCTION`): when ``x`` is a function
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* **989** (`PANIC_CAST_FROM_NULL`): when ``x`` is ``null``
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## See also
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[panic](/reference/control/panic), [assert](/reference/control/assert)
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