Old WP-Import/ Plug-In Installation doesn't work

Hi Together,

I’m sorry to contact you for a probably easy issue. I’m in the middle of migrating the blog from wordpress.com to wordpress.org with following features:

Host: bplaced
FTP Software: Filezilla

So far installed wordpress.org on bplaced and it runs as well. Until I want to import the old data from my wp.com blog. I always got following error message:

An unexpected error occurred. Someting may be wrong with WordPress.org or this server’s configuration. If you continue…

drive.google.com/file/d/0B9uIxR … sp=sharing

Does anyone have an idea what the problem might be? If you need more information, please contact me. Thank you very much.

P.S.: The same message occurs when i want to instal a plug-in.