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NSWorkspace.LaunchApplication (NSUrl, NSWorkspaceLaunchOptions, NSDictionary, NSError) should have an out parameter for NSError.
A quick look shows that SetDesktopImageUrl has the same issue (missing `out`). The whole type should be reviewed.
In fact all ", NSError " cases should be reviewed, they are likely incorrect unless it's a delegate (either a C# one or an ObjC one).
For what it's worth, with `launchApplication:options:error`, error is optional, whereas most of the other methods appear to have error required
"Returns, by-reference, the error if the application was unable to be launched. You may specify nil for this parameter if you do not want the error information."
Looks fixed as @sebastien noted.