Duplicate entry '1029901020' for key 1

[Verboten]

i added a header command and this is what i got:
"Duplicate entry '1029901020' for key 1".
😕 😕 😕

[devarticles]

would be nice to see your code. unfortunally i left my mind reading abilities at home

[Verboten]

cant you just tell me what it means? or, do you not know?

[Verboten]

setcookie("username",$username);
header("Location: ../index.php");

[daynah]

What is in your index.php file?

And are you using a database?