when cloning a blog, it returns errors

An error has occured
An error has occured
An error has occured
An error has occured
An error has occured
An error has occured
An error has occured

When cloning a blog and it keeps repeating the above,

how do I solve the issue?
Do I kill the process? Close the web page?
Delete the blog?

How can I trouble shoot this kind of thing?

What could be causing this?