我收到错误消息“ this.armService.getIsLoaded不是函数”

Question

this.azureSubscriber = this.armService.getIsLoaded().takeWhile(() => this.alive).subscribe(isLoaded => {if(isLoaded) {this.spinner.stop();this.keyForm.get('tenant').enable();this.alive = false;}

“”当我正在测试时，即当我将spinner.stop编写给HaveBeen时称出现错误“