I am trying `arc diff` in my git repo which is hosted by my own gitlab installation.
First I have a `.arcconfig` with only:
```json
{
"phabricator.uri" : "https://phab.mydomain.com"
}
```
And `arc diff` reports: `Exception: Required key 'project_id' is missing from '.arcconfig' file '/myproject/.arcconfig'.`
I tried to fix it with:
```json
{
"phabricator.uri" : "https://phab.mydomain.com",
"project_id": 1
}
```
But then I got: `ERR-CONDUIT-CALL: API Method "differential.creatediff" does not define these parameters: 'arcanistProject'.`
I tried to go through all the guides but could not find anything helpful to this.
Anyone could help me. Thanks a lot.