human
Solve the following python programming problem given the following code:
def handle_queries(self, queries) : 
    response = { 
        
} 
    if (self.query_identifiers [0] in queries) : 
        if (not self.handle_blob_data_payment_rate (queries [self.query_identifiers [0]])) : 
            response ['blob_data_payment_rate'] = 'RATE_TOO_LOW' 
else : 
            response ['blob_data_payment_rate'] = 'RATE_ACCEPTED' 
if (self.query_identifiers [1] in queries) : 
        log.debug ("Received the client's request to send a blob") 
        response_fields = { 
            
} 
        response ['incoming_blob'] = response_fields 
        if (self.blob_data_payment_rate is None) : 
            response_fields ['error'] = 'RATE_UNSET' 
            return defer.succeed (response) 
else : 
            d = self.blob_manager.get_blob (queries [self.query_identifiers [1]], True) 
            def open_blob_for_reading(blob) : 
                if blob.is_validated () : 
                    read_handle = blob.open_for_reading () 
                    if (read_handle is not None) : 
                        self.currently_uploading = blob 
                        self.read_handle = read_handle 
                        log.debug ('Sending %s to client', str (blob)) 
                        response_fields ['blob_hash'] = blob.blob_hash 
                        response_fields ['length'] = blob.length 
                        return response 
log.debug ('We can not send %s', str (blob)) 
                response_fields ['error'] = 'BLOB_UNAVAILABLE' 
                return response 
d.addCallback (queries) 
            return d 
else : 
        return defer.succeed (response) 

    
    

    Fix the buggy line: d.addCallback (queries)
assistant
#Here is Python code to fix the buggy line: d.

d.addCallback (def open_blob_for_reading()