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Created attachment 17629 [details]
Provide the logs
Sometimes when i build the solution i get the "Unknown MSBuild failure. Please try building the project again". Usually clean and rebuild doesn't work so i have to quit and restart Xamarin studio. Please note that i get this error when the target is an android emulator and physical device.
I have this problem often. The only thing that helps is restarting Xamarin studio.
I get this error when targeting iOS simulator or an iOS Device
Same here. Restarting works. And the more projects you have on your solution the more times this happens, by whatever reason.
*** This bug has been marked as a duplicate of bug 43188 ***