Problema non mi funziona la pagina del client del mio retro v 6.3

[dennis099]

salve ragazzi non mi funziona la pagina del client mi fa queste scritte:

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Notice: Use of undefined constant username - assumed 'username' in C:\xampp\htdocs\core.php on line 627

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sapete cosa fare cms configurato database compatibile e dcr configurati in locale forse ho sbagliato a dove mettere i dcr?li ho messi in htdocs hosbagliato? utilizzo dntholocmsv2 e database e come dcr r63 e come emu original phoenix 3.7.1 aiutatemiii