# 0098: Unknown operator

The compiler found an unknown character sequence where a valid [operator](/language/instructions/expressions.md) was expected.

#### Possible solutions:

* Check the syntax and provide a known and valid operator. Valid operators are: `<`, `<=`, `=`, `>`, `>=`, `==`, `<>`, `+=`, `-=,` `*=`, `/=`, `&=`, `|=`, `^=`, `~=`, `%=`, `>>=`, `<<=`, `#=`, `+=@`, `-=@`.


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