Twitter API Error

Hi

when i press the manually tweet button i geht this php errors

Warning: simplexml_load_string() [function.simplexml-load-string]: Entity: line 1: parser error : Space required after the Public Identifier in /home/www/whatpulse.org/www/my/twitter/index.php on line 138

Warning: simplexml_load_string() [function.simplexml-load-string]: in /home/www/whatpulse.org/www/my/twitter/index.php on line 138

Warning: simplexml_load_string() [function.simplexml-load-string]: ^ in /home/www/whatpulse.org/www/my/twitter/index.php on line 138

Warning: simplexml_load_string() [function.simplexml-load-string]: Entity: line 1: parser error : SystemLiteral " or ’ expected in /home/www/whatpulse.org/www/my/twitter/index.php on line 138

Warning: simplexml_load_string() [function.simplexml-load-string]: in /home/www/whatpulse.org/www/my/twitter/index.php on line 138

Warning: simplexml_load_string() [function.simplexml-load-string]: ^ in /home/www/whatpulse.org/www/my/twitter/index.php on line 138

Warning: simplexml_load_string() [function.simplexml-load-string]: Entity: line 1: parser error : SYSTEM or PUBLIC, the URI is missing in /home/www/whatpulse.org/www/my/twitter/index.php on line 138

Warning: simplexml_load_string() [function.simplexml-load-string]: in /home/www/whatpulse.org/www/my/twitter/index.php on line 138

Warning: simplexml_load_string() [function.simplexml-load-string]: ^ in /home/www/whatpulse.org/www/my/twitter/index.php on line 138

Hi,

Could you tell me your twitter username?