uts中怎么定义异步方法

我在一个类里写了一个异步方法```javascript
async login(user_name:string,password:string):Promise<boolean>{
try{
const res = await loginApi({ user_name, password })
this._token = res.access_token
this._id = res.user_info.user_id
uni.setStorageSync('token',this._token)
this.fetchUserInfo()
return true
}
catch(error:any){
console.log(error)
return false
}
}

loginApi是一个promise请求，运行到安卓手机上时报错```javascript  
error: None of the following functions can be called with the arguments supplied: ‌  
16:45:43.649 ‌public suspend fun <T> await(promise: UTSPromise<TypeVariable(T)>): TypeVariable(T) defined in io.dcloud.uts‌  
16:45:43.649 ‌public suspend fun <T> await(def: Deferred<TypeVariable(T)>): TypeVariable(T) defined in io.dcloud.uts‌  
16:45:43.649 at store/userStore.uts:33:15  
16:45:43.649 31 |   async login(user_name:string,password:string):Promise<boolean>{  
16:45:43.649 32 |    try{  
16:45:43.649 33 |     const res = await loginApi({ user_name, password })  
16:45:43.649    |                 ^  
16:45:43.649 34 |     this._token = res.access_token  
16:45:43.649 35 |     this._id = res.user_info.user_id

请问这个要怎么写