This error is all because of special characters.
I had this error because I put one brace more mitakenly. But If I had no mistake at all, then I'll have to check the below codes.
https://mine-it-record.tistory.com/157
https://stackoverflow.com/questions/54287922/the-valid-characters-are-defined-in-rfc-7230-and-rfc-3986
