ORA-36691: (NTEXTCNV02) Invalid escape sequence in argument
to UNISTR function: string.
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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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