Error importing a blog snapshot

I'm trying to import a snapshot from http://blog.idealpress.es to http://desarrollo.idealmedia.es/revistapuertadeembarque and gives me the following error:
Internal Server Error

The Server Encountered an internal error or misconfiguration and WAS Unable to complete your request.
Please contact the server administrator, and inform them admin@idealpress.es of the time the error occurred, and anything you Might Have done that May Have Caused the error.
More information About this Error May be available in the server error log.
Apache Server at Port 80 desarrollo.idealmedia.es

How I can fix it?