has followed the steps of Vadin on his publication to move documents from one library to another preserve version history using "web request" and author.dll without success.
 
My Worklow is on Office 365 and I am sure that something I have configured wrong, 

The variable with the content is:

This is the library when I have created the workflow and when the document is saved. 

And this is the error:

Maybe I have wrong the server_name or oldulr parameter?