Compiling Xamarin.Android project with monodevelop

I'm compiling a Xamaran.Android project on linux using Mono and MonoDevelop to build the solution.

My project is a simple HelloWorld for now.

And when I build the application, I all time get the following error :

/usr/lib/monodevelop/bin/MSBuild/4.0/MonoDevelop.Projects.Formats.MSBuild.exe /t:Package /p:Configuration=Release HelloWorld/HelloWorld.sln
System.ArgumentNullException: Value cannot be null.
Parameter name: String
  at System.Number.StringToNumber (System.String str, NumberStyles options, System.NumberBuffer& number, System.Globalization.NumberFormatInfo info, Boolean parseDecimal) <0x74af1acc + 0x001e0> in <filename unknown>:0 
  at System.Number.ParseInt32 (System.String s, NumberStyles style, System.Globalization.NumberFormatInfo info) <0x74af02d4 + 0x000e3> in <filename unknown>:0 
  at System.Int32.Parse (System.String s) <0x74ac8b2c + 0x0001f> in <filename unknown>:0 
  at MonoDevelop.Projects.Formats.MSBuild.MainClass.WatchProcess (System.String procId) <0x76840f40 + 0x0002b> in <filename unknown>:0 
  at MonoDevelop.Projects.Formats.MSBuild.MainClass.Main () <0x76ae54b8 + 0x0001f> in <filename unknown>:0 

Of course there is no StringToNumber method called in my project. Is there an issue with monodevelop causing this ?