Mysqldump.exe Unknown option --no-beep
Find all my.ini file
Replace no-beep from everywhere (not only client) 'coz there is no such option.
But to do a temporary fix you can use no-defaults as follows:

"C:\Program Files (x86)\MySQL\MySQL Server 5.6\bin\mysqldump.exe" --no-defaults -u root -p******* my_database &gt; backups/my_database_backup_20151221121320.sql