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Launching Xcode Interface Builder by double-clicking a ViewController.xib from within MonoDevelop results in the error, "Error updating Objective-C type information.", inside of MonoDevelop after you create an Outlet in IB and return to MonoDevelop.
Steps to Reproduce: Minimized, easy-to-follow steps that will trigger the bug. Include any special setup steps.
1) Create a new Empty iPhone project in MonoTouch.
2) Add a new iPhone View Controller named MainViewController
3) From MonoDevelop 3.0.2 double-click MainViewController.xib
to launch Interface Builder in Xcode 4.3.2.
4) Drag a Label control onto the View.
5) Hold control and drag/drop the line under the @interface definition in
the .h file and choose Connection type Outlet, Name = TestLabel, "Connect"
6) Verify @property (retain, nonatomic) IBOutlet UILabel *TestLabel;
gets added to the .h file.
7) Switch back to MonoDevelop 3.0.2. to get error message.
Receive the error inside of MonoDevelop 3.0.2 of:
"Error updating Objective-C type information.
Both arguments to IsDerivedFrom() must be from the same compilation."
System.InvalidOperationException: Both arguments to IsDerivedFrom() must
be from the same compilation.
(ITypeDefinition type, ITypeDefinition baseType) [0x00029] in /Users
Unknown. I assume for this error to just not occur. This was my first attempt to use Mono, MonoDevelop, and MonoTouch, so I am not sure what to expect other than no error.
Mac OS X Lion 10.7.4 (11E53)
2.4 GHz Intel Core i5
4 GB 1067 MHz DDR3
Intel HD Graphics 288 MB
Xcode Version 4.3.2 (4E2002)
MonoTouch version and Mono Version?? =
whatever MonoTouch installer would have picked on 6/12/2012.
My Mac Book Pro did not have Mono, MonoDevelop, or MonoTouch on it
before today when the MonoTouch installer installed all its pre-reqs.
I am reading the book, "Mobile Development with C#"
and doing first code exercise in Chapter 2 on ebook PDF pages 12-15.
As soon as I finish creating the "Outlet" or "Action" on the MainViewController and try to go back to MonoDevelop I get the error described above.
Ref - Book source code I was trying to manually recreate when this happened:
*** This bug has been marked as a duplicate of bug 5441 ***
I upgraded to MonoDevelop 22.214.171.124 Beta and it seems to have resolved this issue.