If you see this type of error:
Duplicate Row #195 (Country "GBR", Region/State "*", Zip "Pa1___")
exception 'Zend_Db_Statement_Exception' with message 'SQLSTATE: Integrity constraint violation: 1062 Duplicate entry '1-GB-0--Pa1___---- 1.0000-10000000.0000--1.0000-49.9400-0.0000-10' for key 'dest_country'' in C:\xampp\htdocs\productmatrix\lib\Zend\Db\Statement\Pdo.php:238
this means you have 2 rows in your csv file that are exactly the same in terms of logic. Check your csv for duplicates. Usually the Country in above message will give a good clue as to problem area.