WordPress import error: file copy errors

I get a number of errors when attempting to import a WordPress .xml export file. There are a number of different errors (centered around AJAX) as well as file copy errors along the line of:

The specified file http://recommend1959.files.wordpress.com/2009/07/cropped-2189114428_e112... could not be copied to public://2009/07/cropped-2189114428_e112edf9a2_o.jpg.

Additional errors include:

Warning: fopen() [function.fopen]: URL file-access is disabled in the server configuration in wordpress_migrate_import_form_submit() (line 401 of /home/p05541r5/public_html/blog_drupal/modules/wordpress_migrate/wordpress_migrate.pages.inc).
Warning: fopen(http://ldmartin1959.wordpress.com/wp-login.php) [function.fopen]: failed to open stream: no suitable wrapper could be found in wordpress_migrate_import_form_submit() (line 401 of /home/p05541r5/public_html/blog_drupal/modules/wordpress_migrate/wordpress_migrate.pages.inc).
Warning: fopen() [function.fopen]: URL file-access is disabled in the server configuration in wordpress_migrate_import_form_submit() (line 404 of /home/p05541r5/public_html/blog_drupal/modules/wordpress_migrate/wordpress_migrate.pages.inc).
Warning: fopen(http://ldmartin1959.wordpress.com/blog/wp-login.php) [function.fopen]: failed to open stream: no suitable wrapper could be found in wordpress_migrate_import_form_submit() (line 404 of /home/p05541r5/public_html/blog_drupal/modules/wordpress_migrate/wordpress_migrate.pages.inc).
Could not find login page for ldmartin1959.wordpress.com
Warning: fclose(): supplied argument is not a valid stream resource in wordpress_migrate_import_form_submit() (line 410 of /home/p05541r5/public_html/blog_drupal/modules/wordpress_migrate/wordpress_migrate.pages.inc).

I know nearly nothing about Drupal. Not sure what is happening or why. Can someone provide me some guidance?

Thank you.