[MonoDevelop] error creating Android App

[Daniel Soto]

Hi everyone!

I'm trying to learn Mono for Android using Monodevelop 2.6 Beta 3, so it 
let me install the Monodroid addin. But when I create a new solution, 
several errors appears when Monodevelop tries to create the solution:

File Activity1.cs could not be written
System.MissingMethodException: Método no encontrado: 
'MonoDevelop.Projects.ProjectFile 
MonoDevelop.Projects.ProjectFileEventArgs.get_ProjectFile()'.

File Resources could not be written.
System.MissingMethodException: Método no encontrado: 
'MonoDevelop.Projects.ProjectFile 
MonoDevelop.Projects.ProjectFileEventArgs.get_ProjectFile()'.

File Properties could not be written.
System.MissingMethodException: Método no encontrado: 
'MonoDevelop.Projects.ProjectFile 
MonoDevelop.Projects.ProjectFileEventArgs.get_ProjectFile()'.

File Assets could not be written.
System.MissingMethodException: Método no encontrado: 
'MonoDevelop.Projects.ProjectFile 
MonoDevelop.Projects.ProjectFileEventArgs.get_ProjectFile()'.

... and Monodevelop fails when creates the solution. The solution 
explorer only shows the new project in red "Load failed".

An issue that I had resolved previously, was copy manually the file 
Mono.Posix.dll due as version 4.0.0 was not found by the addin, only 
2.0.0 exists in my system (I installed GTK# 2.12.10), but I had 
installed mono 2.10 with GTK# to get Mono.Posix.dll 4.0.0, but now I 
have this problem that I don't know how to solve.

I'm using Monodevelop 2.6 beta 3
Mono for Android addin version 2.6.4, Monodevelop tell me that this 
version is the lastest.
Windows 7.
.NET 4.0
Mono for Android 1.0.1.10323
Android SDK r12 (the lastest)

Please, help me.

Regards.

Daniel.