Only one usage of each socket address (protocol/network address/port) is normally permitted?

by
  1. Open CMD and type: netstat -a
  2. Take a look in the Local Address column.
  3. Look at the port portion.
  4. If the port in your program is already active(in use) in another program, you should use another port or kill the active process to make the port free.
  5. I changed my port in my program to something else.

It Worked!

Big thanks to: @DavidSchwartz, @Gusman

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)