This article has been ported to Troubleshooting Blog Imports
Genaral Blog Import Issues
Resolving issues when importing XML files from WordPress
ERROR: [ There was a system error.-'excerpt' is an undeclared namespace. Line 104, position 2.]. Import process failed on line: [0] Please ensure 1) mandatory columns are present, 2) you have the right number of columns, 3) Line breaks appear at the end of each line and not within the line.
This particular problem (with the excerpt issue) is a known bug in the WordPress export code.
http://trac.wordpress.org/ticket/7624
You can correct this issue by adding xmlns:excerpt=" http://wordpress.org/excerpt/1.0" to the <rss> XML tag at the top of the file.
Another common error is with <wp:meta_value>. If you have an ampersand (&) between these tags, the import will fail. Be sure to remove all instances of the & symbol before importing.
Additionally, the author name must not be longer than 256 characters. That can also cause import issues with WordPress.
Visit the WordPress site to get more information.

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