# `UnicodeConversionError`
[🔗](https://github.com/elixir-lang/elixir/blob/v1.20.0-rc.3/lib/elixir/lib/exception.ex#L2246)

An exception raised when converting data to or from Unicode.

For example:

    iex> String.to_charlist(<<0xFF>>)
    ** (UnicodeConversionError) invalid encoding starting at <<255>>

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*Consult [api-reference.md](api-reference.md) for complete listing*