Problemas com php+mysql

Pessoal estou tentando conectar com flex com php usando o amfphp so que qdo rodo o browse do amfphp tenho este erro:

Error retrieving service info:

Invalid AMF message

Fatal error: Uncaught exception 'VerboseException' with message 'Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs\sequencial_flex_amfphp\amfphp\services\sequencial_flex_amfphp\Teste.php:1)' in C:\xampp\htdocs\sequencial_flex_amfphp\amfphp\core\amf\app\Gateway.php:191

Stack trace:

#0 C:\xampp\htdocs\sequencial_flex_amfphp\amfphp\core\amf\app\Gateway.php(191): amfErrorHandler(2, 'Cannot modify h...', 'C:\xampp\htdocs...', 191, Array)

#1 C:\xampp\htdocs\sequencial_flex_amfphp\amfphp\gateway.php(152): Gateway->service('Content-type: a...')

#2 {main}

thrown in C:\xampp\htdocs\sequencial_flex_amfphp\amfphp\core\amf\app\Gateway.php on line 191

Alguem poderia me ajudar.

Grato