I'm following the official documentation for installing and configuring Symfony. when i try http://localhost:8000/app/example, a message appears :
"The YAML value does not appear to be valid UTF-8"
"500 Internal Server Error - ParseException"
This message is followed by "Stack Trace" and a long list of exceptions, the "Logs" containg 1 error and finally "Stack Trace (Plain Text)"
What should i do ? thanks