TypeError: The "chunk" argument must be of type string or an instance of Buffer or Uint8Array. Received an instance of Promise

TypeError: The "chunk" argument must be of type string or an instance of Buffer or Uint8Array

TypeError: The "chunk" argument must be of type string or an instance of Buffer or Uint8Array. Received an instance of Promise
    at write_ (node:_http_outgoing:945:11)
    at ServerResponse.end (node:_http_outgoing:1102:5)
    at /Users/rahulxf/JourneyToXYZ/socket.io-prometheus-metrics/dist/index.js:58:17
    at Layer.handle [as handle_request] (/Users/rahulxf/JourneyToXYZ/socket.io-prometheus-metrics/node_modules/express/lib/router/layer.js:95:5)
    at next (/Users/rahulxf/JourneyToXYZ/socket.io-prometheus-metrics/node_modules/express/lib/router/route.js:149:13)
    at Route.dispatch (/Users/rahulxf/JourneyToXYZ/socket.io-prometheus-metrics/node_modules/express/lib/router/route.js:119:3)
    at Layer.handle [as handle_request] (/Users/rahulxf/JourneyToXYZ/socket.io-prometheus-metrics/node_modules/express/lib/router/layer.js:95:5)
    at /Users/rahulxf/JourneyToXYZ/socket.io-prometheus-metrics/node_modules/express/lib/router/index.js:284:15
    at Function.process_params (/Users/rahulxf/JourneyToXYZ/socket.io-prometheus-metrics/node_modules/express/lib/router/index.js:346:12)
    at next (/Users/rahulxf/JourneyToXYZ/socket.io-prometheus-metrics/node_modules/express/lib/router/index.js:280:10)
    
    
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 private initServer() {
    this.express = express();
    this.expressServer = this.express.listen(this.options.port);
    this.express.get(this.options.path, async (_req: express.Request, res: express.Response) => {
        try {
            const metrics = await this.register.metrics(); // Await the Promise
            res.set('Content-Type', this.register.contentType);
            res.end(metrics); // metrics is now a string
        } catch (error) {
            res.status(500).end('Error collecting metrics');
        }
    });
}