Angular Reactive Form Dropdown Select Value

Hi,

I am using reactive form in angular. In this form, I am sending a request to the API. But I am getting select value and it gives an error. How can I resolve this error.

Error : "The JSON value could not be converted to System.Int32. Path: $.OperationClaimId | LineNumber: 0 | BytePositionInLine: 34."

  
 
 
            Claim Seç
            Users
            Admin           
          

 UserClaimsEdit= new FormGroup({
    UserId: new FormControl('',[Validators.required ]),
    OperationClaimId: new FormControl('',[Validators.required ]),
  
  });

  SaveClaims(){
    
    this.service.addClaims(this.UserClaimsEdit.value).subscribe(res=>{
    
  
     this.UserClaimsEdit.reset();
  
    });

 

  }