illegal character encoding in string literal

This error message typically occurs when a string literal contains characters that are not supported by the chosen character encoding.

For example, if a string contains a special character like a non-ASCII character or an emoji, and the encoding used to save or display the string does not support that character, you may see this error message.

To fix this error, you can try changing the character encoding to one that supports the problematic characters, or you can remove the problematic characters from the string