;
```
However any call I make without specifying a `callback` throws a `SendBirdException: Invalid parameter`, which is not a very informative error - took me a while to understand which was the parameter that was causing the issue.
This doesn’t work:
```javascript
sb.GroupChannel.createChannelWithUserIds(userIds, false, channelName, "", "", "") // no callback
```
This doesn’t work:
```javascript
sb.GroupChannel.createChannelWithUserIds(userIds, false, channelName, "", "", "", undefined) // undefined callback
```
This works:
```javascript
sb.GroupChannel.createChannelWithUserIds(userIds, false, channelName, "", "", "", (c) => {})
```
Can you make it so that the `callback` parameter is **really** optional as the type definitions say?
It would also be cool if all other parameters but the `userIds` were also optional so that we don’t have to set them as empty strings in order for it to work, that’s just silly.
Thanks!
---
### Author:  [@Tyler](https://community.sendbird.com/u/Tyler)
#### Post date: [April 4, 2022, 6:06pm UTC](https://community.sendbird.com/t/createchannelwithuserids-throws-sendbirdexception-invalid-parameter/4344/2 "2022-04-04T18:06:52Z")
Hi @MCastanho,
Welcome to the Sendbird Community.
In order to try and better understand the overall issue, can you tell me why you’d want to create a channel via the SDK and not have a callback or promise? Seems like you’d want to get the resulting channel back.
---
### Author:  [@MCastanho](https://community.sendbird.com/u/MCastanho)
#### Post date: [April 5, 2022, 9:05am UTC](https://community.sendbird.com/t/createchannelwithuserids-throws-sendbirdexception-invalid-parameter/4344/3 "2022-04-05T09:05:05Z")
Hi @Tyler ,
Thanks.
I am using a promise, I just didn’t write it there to make the code snippets compact.
I am doing this:
```javascript
sb.GroupChannel.createChannelWithUserIds(userIds, false, channelName, "", "", "", (c) => {})
.then((channel) => {/* send a message to this channel */})
```
And in the meantime I realized there’s a possible syntax for this function that takes only the `userIds` and an **optional** `callback`, like this:
```javascript
sb.GroupChannel.createChannelWithUserIds(userIds, (c) => {})
.then((channel) => {/* send a message to this channel */})
```
But neither of them work if I remove the `callback`, which makes the `callback` not optional, contrary to what the documentation and types definition suggest.
---
### Author:  [@Tyler](https://community.sendbird.com/u/Tyler)
#### Post date: [April 5, 2022, 3:19pm UTC](https://community.sendbird.com/t/createchannelwithuserids-throws-sendbirdexception-invalid-parameter/4344/4 "2022-04-05T15:19:41Z")
Hi @MCastanho,
Let me dig into this and see why this is happening. I’ll circle back when I have some more information.
---
### Author:  [@Tyler](https://community.sendbird.com/u/Tyler)
#### Post date: [April 5, 2022, 11:21pm UTC](https://community.sendbird.com/t/createchannelwithuserids-throws-sendbirdexception-invalid-parameter/4344/5 "2022-04-05T23:21:37Z")
Hi @MCastanho,
I’ve confirmed that there is in fact an issue with `createChannelWithUserIds`. This issue actually exists with `updateChannel` as well.
While we look to get this corrected long term, you can work around this by calling `createChannel` directly while passing in an instance of `GroupChannelParams`. A quick example to achieve the same as `createChannelWithUserIds` would be this (Matching your above example):
```javascript
const sb = SendBird.getInstance();
const params = new sb.GroupChannelParams();
params.addUserIds(['exampleUser01', 'exampleUser02']);
params.isDistinct = false;
params.name = channelName
const channel = await sb.GroupChannel.createChannel(params);
```