INVALID API VALIDATION ERROR

i am getting invalid api validation error..
the code what i have written is...
<?php echo"<form action='http://www.slideshare.net/api/1/upload_slideshow' method='post' ENCTYPE='multipart/form-data?>";
echo"username:<input name="username" type="text" /><br />";
echo"password:<input name="password" type="password" /><br />";
$ts=time();
$api_key='N7BBoxsa';
$hash=eDlUiCYC."$ts";
$slideshow_title=" api-conference-2008";
echo"<input name="api_key" type="hidden" value="$api_key" /><br />";
echo"<input name="ts" type="hidden" value="$ts" /><br />";
echo"<input name="hash" type="hidden" value="$hash" /><br />";
echo"<input name="slideshow_title" type="hidden" value="$slideshow_title" /><br />";
echo"<input name="slideshow_srcfile" type="file" /><br />";
echo"<input name="slideshow_description" type="hidden" />" ;
echo"<input name="submit" type="submit" value="submit" />";
echo"";
 
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