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Created attachment 6718 [details]
Screen capture of invalid references
When opening an existing project in XS 5.0 (that works just fine in older versions of XS), both two of my added components (ZipArchive & Json.Net) indicates that their references have not been added to the project despite the fact that they are visible under references. (See attached screenshot). If I remove the existing references and add new ones then XS is happy again.
Compiling for the emulator now works fine, but if I compile for iOS device I get 3 errors:
Error MT5211: Native linking failed, undefined Objective-C class: _OBJC_CLASS_$_ZipArchiveDelegate. If '_OBJC_CLASS_$_ZipArchiveDelegate' is a protocol from a third-party binding, please check that it has the [Protocol] attribute in its api definition file, otherwise verify that all the necessary frameworks have been referenced and native libraries are properly linked in. (MT5211) (Involve)
Error MT5210: Native linking failed, undefined symbol: _OBJC_METACLASS_$_ZipArchiveDelegate. Please verify that all the necessary frameworks have been referenced and native libraries are properly linked in. (MT5210) (Involve)
Error MT5202: Native linking failed. Please review the build log. (MT5202) (Involve)
Let me know if I can provide any further information. Thanks!
Btw, XS 5.0 looks great! :)
Created attachment 6719 [details]
IDE log file
Created attachment 6720 [details]
Component log file
The 3rd party author of ZipArchive has not updated his component to be compatible with the new registrars  requirements.
The new registrars are default in 7.2.1  but were introduced a year ago in 6.2.6 . They fixes several issues but can require some (generally minor) changes to bindings. Most components have been updated, some for a long time and some recently.
The workaround is to use the older registrars by adding this to the "Additional mtouch arguments" of your project:
p.s. for the issues specific to XS5 can you please file a separate bug report (on the "Xamarin Studio" product). You can copy/paste the top part of this bug report. Thanks!
*** Bug 19516 has been marked as a duplicate of this bug. ***