Can anyone please help me.

I have been looking around for help with the following error I received when trying to import a test.txt file.

Warning: fopen(/var/www/html/uploads/test.txt): failed to open stream: No such file or directory in /var/www/html/catalog/admin/includes/easypopulate/classes/eclipse/FileIterator.php on line 146

Warning File Import Failed! Primary index column p_products_id or c_categories_index_path missing from uploads file. Please consult the readme.html file for more information

The file was exported from Easy Populate and then I added 1 line and then uploaded the file and tried to import the file. The above error occurred. I tried to change the permissions on the files uploaded to see if that was a problem and the same error occurred. When I changed the permission on the file to "777" and tried, the same error occurred and the file then disappeared off the server.

Please can you assist with this problem.

Cheers