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|ERROR: Encoding cannot represent character|
SWI-Prolog is a Unicode application. This means all characters are internally encoded as large integers in a uniform space. This encoding can represent any character in any language. Streams however are sequences of bytes, i.e., sequences of integers in the range 0..255. This implies some encoding is needed to represent Unicode characters. Various encodings exist, some of which cannot represent all Unicode characters. SWI-Prolog uses the default encoding of the platform on which it runs. If it must write a character that does not fit in this encoding it gives this error message.
There is no easy answer on what to do. Understanding international character encoding issues is really hard. The first things to know are in the SWI-Prolog Reference Manual, section Wide character support.