PackagingResults:Error: Error Unknown Cook Failure

Hi all, i really need some help, i am a little lost in this problem.
I have a project and i am trying to "Package project - Windows 64 bit/32 "
The process run for a minute then shout down .
Just a few hours ago the error in red was "automation tool was unable to run successfully"
Now the error in red is ""PackagingResults:Error: Error Unknown Cook Failure ""

A couple of weeks ago i tryed to package and it was done correctly.

1) I have a lot of little error about texture and blueprint that i dont have anymore in my project,
but somehow they still there and during the package i dont find the texture or stuff…
can be this the source of problem? , how can i clean this mysterious little trash?

2) Which is the problem , why i cant package?

I use the unreal 4.10.4

i attach the TXT from - AppData\Roaming\Unreal Engine\AutomationTool\Logs\

Ask if you need more infos

The error only happen on this project.

I can successfully package a new simple project empty.

I have the updated driver and visualc2015

I have already packed this project some weeks ago (sure a lot changed from then)

Thasks to all for any help

link text

Resolved, after read carefully the log i found an old , very old blueprint that somehow have a spawn actor from class, with nothing selected.
Fixed selecting again the right actor class