Who can help me to fix this error ? Please
Probably a number of different people.
Please start by reading How do I ask a good question? - Help Center - Stack Overflow.
You’ll need to provide a description of your system and what is generating / providing that url being requested. You’ll also need to post the relevant parts of your code - probably at a minimum your urls.py to get started.
Finally, please don’t post screenshots here. Copy/paste the relevant information into the body of your message. If it’s code, enclose the block of code between lines of three backtick - ` characters. You’ll have a line of ```, then your code, then another line of ```.