Answer / guest

Cause: The user called the UNISTR function on a string that
had an invalid escape sequence. The only valid escape
sequences in UNISTR are 1.) an escape-escape sequence, and
2.) an escape, followed by exactly four hexadecimal digits.

Action: Make sure that all escape sequences in UNISTR
arguments are exactly four hexadecimal digits. To represent
codepoints whose value is less than 0x1000, use preceding
zeros. WRONG: 0x10; RIGHT: 0x0010.

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