使用OSS的PHP sdk版本，总是报这个错误： InvalidBucketName: The specified bucket is not valid

代码：

配置：

'OSS_AccessKeyId' =>.... ,
'OSS_AccessKeySecret' =>...... ,
'OSS_BjEndpoint' => "http://oss-cn-beijing.aliyuncs.com" ,
代码：
class OssClientApi {
     private static $_ossClient = false ;

     private static function createOssClient(){
         if ( is_object ( self :: $_ossClient ) ) return self :: $_ossClient ;

         $accessKeyId = C( 'OSS_AccessKeyId' );
         $accessKeySecret = C( 'OSS_AccessKeySecret' );
         $endpoint = C( 'OSS_BjEndpoint' );
         echo "endpoint:" . $endpoint . " \r\n " ;
         try {
             self :: $_ossClient = new OssClient( $accessKeyId , $accessKeySecret , $endpoint , true );
        } catch (OssException $e ) {
            addLogError( "can not creat OssClient. msg:" . $e ->getMessage(), __FUNCTION__ , __LINE__ );
             return false ;
        }
         return self :: $_ossClient ;
    }

     public static function put( $bucket , $object , $content ){
         self :: createOssClient ();
         if ( false == self :: $_ossClient ) return false ;

         try {
             self :: $_ossClient ->putObject( $bucket , $object , $content );
        } catch (OssException $e ) {
            addLogError( "can not put object. msg:" . $e ->getMessage(), __FUNCTION__ , __LINE__ );
             print_r ( $e );
             return false ;
        }
         return true ;
    }

}
我使用的sdk是2.0.4版本，最新版，Endpoint使用[size=; font-size: 12pt,12pt] http://oss-cn-beijing.aliyuncs.com 或 oss-cn-beijing.aliyuncs.com都是报这个错误
请大牛们帮忙看看，这到底是神马问题？