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Question

I can't find any solution to this problem.

I had built my project in Release mode. When I changed to Debug mode and tried to rebuild the project, I got this error. And I KEEP getting this error no matter what I do.

I cleaned the project. No joy. Restarted VS2019. No joy. Deleted the bin and obj folders. No joy.

Switched back to Release mode. No joy.

The boss is waiting for this project and I can't build it because of this stupid unspecified error.

"...Another Xamarin operation is running..."

WHAT OPERATION???!!! How can I cancel that operation?

I rebooted the computer. No joy.

I own the paid version of Visual Studio Professional and this is not ok!!

Edit: I opened another version of the same project. This built ok.

Reopened the problem project and did not get the error.

Just wasted 2 hours on this

Answer 1

A workaround is :

• Unload the Android project
• Clean the solution
• Reload the android project and restore it as Startup project

Now you can clean the solution and rebuild.

Answer 2

Unload the given project
Reload the given project
Clean the given project
Build

Solved.

Answer 3

Apart from restarting you may also need to delete bin and obj folders.

Answer 4

I had the same problem, but only on Android and not on UWP. Edit: I opened another version of the same project on Android. This built not ok. Reopened the problem project and did not get the error, so, problem solved. Lots of thanks for your solution.

Answer 5

I started having this recently -- I use VS for Win connected to Mac to do the build for iOS project.

Let's face it, it's always wonky. But this got real bad today -- tried restarting VS, rebooting Mac, deleting bin/obj, etc.

Finally comment from OP made me think of something I didn't try -- shut down vs, delete the .vs folder, the bin/obj, and restart VS. I hate to delete the .vs cuz it resets stuff, including "reloading" my Android project, which I'm not currently working on.

Well, to early to say, but it worked once.