[Mono-list] Error building with MonoDevelop

[Baltasar García Perez-Schofield]

Hi, there,

I'm using MonoDevlop with one of my projects, and suddenly it has stopped
building. I complains with two error messages:

Error: Error initializing task Message: Could not load file or assembly
'Microsoft.Build.Tasks.v4.0' or one of its dependencies. The system cannot
find the file specified. (Colorado)

Error: Error initializing task CreateItem: Could not load file or assembly
'Microsoft.Build.Tasks.v4.0' or one of its dependencies. The system cannot
find the file specified. (Colorado)

I'm using LUbuntu 15.04, totally updated, with the Xamarin packages for
Mono-4.0 PPA. It worked okay yesterday!

I'm using Xamarin Studio for Windows at home, over the same directory, This
had not give any problems so far.

-- Baltasar
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