Heads Up :
The post you are writing will appear in a public forum. Please ensure all content is appropriate for public consumption. Review the employee guidelines for the community here.
I just had this issue in 9.1(7). I found by shortening the source filename the copy worked fine, I went from a filename with 35 characters to one with 17 the error disappeared.
I was using copy ftp: start to push a new startup config.
