Seaquel
SQL Server error code

SQL Server error 9841

SQL Server raises error 9841 at severity 16, which marks a problem with the query or data that you can correct.

An invalid Unicode escape sequence was specified in the input. Unicode escape sequences should be specified as <UESCAPE character>XXXX or <UESCAPE character>+XXXXXX where X is a <hexit>.
Msg9841
Severity16
Group9000–9999

Source: Database Engine events and errors