I want to upgrade my magento 1.4x to magento 1.6x by installing the
first magento 1.6x n then i copy folder app, skin, media to new
installation magento 1.6x and dump the sql database. but error is
happened. this is the error..
Error in the file:
- SQLSTATE: Integrity constraint violation: 1062 Duplicate
entry ‘3-thumbnail’ for key ‘entity_type_id’
Please help me guys, how i can fix this problem..?