You really shouldn't start a new thread for this. It would just cause some people to answer here and some there when there's no reason for it. Post any further replies in the other thread.
If you look at Help>>Explain Error, you will see that error 7 is "File not found". If you place indicators to see what the file paths are for the copy operation you should probably understand what the problem is. Again, why not use VI templates?
I think that Copy File needs a "true" file as input. The dynamic vi is not a file from the point of view of the operating system.