How to use the @clr/angular.ClrLoadingState.ERROR function in @clr/angular

this.auth.validateToken().subscribe(res => {
      this.validateLoading = res.error
        ? ClrLoadingState.ERROR
        : ClrLoadingState.SUCCESS;
    });
  }

private handleLoginError(err: ApolloError) {
    this.loginBtnState = ClrLoadingState.ERROR;

    this.core.handleFormValidationErrors(this.loginForm, err);
  }

this.auth.signIn(this.username, this.password).subscribe(res => {
      this.signInLoading = res.error
        ? ClrLoadingState.ERROR
        : ClrLoadingState.SUCCESS;
    });
  }

}, error => {
                this.scanBtnState = ClrLoadingState.ERROR;
            });
    }

}, error => {
                this.inlineAlert.showInlineError(error);
                this.saveBtnState = ClrLoadingState.ERROR;
            });
    }

}, error => {
                this.inlineAlert.showInlineError(error);
                this.saveBtnState = ClrLoadingState.ERROR;
            });
    }