Angular gives me ERROR X when building a project

I don't know why I get this error. I do have 2 Angular 17 services. When I build the first one, everything is working with no error or issue. I duplicate the 1st one to the 2nd one and then I modify its methods (access to .NET Apicontrollers). When I build the project then I got the message. Also, I try to create a brand new service (similar to the first one) and I still get the message. The only way NOT TO SEE the message is to delete the 2nd service from the project completely.

constructor(
private http: HttpClient,
public router: Router
)
{
this.apiURL = environment.apiUrl;
}


my method to access (there is only one method in the service) the .Net API controller which is related to error message

getRecords(): Observable<any[]> {
return this.http.get<any[]>(this.apiURL + 'LinkWebTube/GetLinktubes')
}


PS C:\Users\admin\source\repos\playground\Playground\ClientApp\src> ng build
⠇ Building...
ERROR X {
headers: n {
normalizedNames: Map(0) {},
lazyUpdate: null,
headers: Map(0) {}
},
status: 0,
statusText: 'Unknown Error',
url: 'https://localhost:7131/LinkWebTube/GetLinktubes',
ok: false,
name: 'HttpErrorResponse',
message: 'Http failure response for https://localhost:7131/LinkWebTube/GetLinktubes: 0 undefined',
error: TypeError: fetch failed
at Object.fetch (node:internal/deps/undici/undici:11457:11)
at process.processTicksAndRejections (node:internal/process/task_queues:95:5) {
cause: Error: connect ECONNREFUSED ::1:7131
at TCPConnectWrap.afterConnect [as oncomplete] (node:net:1494:16) {
errno: -4078,
code: 'ECONNREFUSED',
syscall: 'connect',
address: '::1',
port: 7131
}
}

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