I can't fetch a user's permsissions from a server

[Scarner56]

Hello
I have a problem
I can't fetch a user's permissions from a server

Here is the code:

app.get("/yonet", async(req, res) => {
  if(!req.user) return res.redirect("/hata?type=giris")
  let id = req.query.server
  if(!id) return res.redirect("/hata?type=bulunamadı")
  let p =  new Promise(async (resolve, reject) => {
    let sunucu = await client.guilds.cache.get(id)
    let a = await sunucu.members.cache.get(req.user.id)
    console.log(a)
    if(a.permissions.has("MANAGE_GUILD")){
      resolve()
    }else {
      reject()
    }
    p.then((pe) => {
      console.log(pe)
    })
  }) 

    renderTemplate(res, req, "yonet/server.ejs", {id})

})```

And the error:
```js
    if(a.permissions.has("MANAGE_GUILD")){
         ^

TypeError: Cannot read property 'permissions' of undefined

PLS help asap

[almeidx]

That error suggests the user was not found in the cache.

So, instead of relying solely on it (the cache), fetch the member using await sunucu.members.fetch(req.user.id)