Import XML error

Hi, sorry for my English, I can't write very well. I hope my problem's understood.

When I want to import an XML of my series on my old account, I get an error page that says:
"A critical error has occured (93156130219)

This mistake has-been logged and will be Dealt With asap."

I am unable to import the XML file.
I do not know if I've done something wrong.