I am trying to create a content type from JSON URL in Drupal 6. The JSON url is fixed and everyday new content will be added to that url. Currently I converted JSON to csv and stored data in the csv file with header(csv data is not same as json data two new columns are added to get desired content data). Now I want to import csv file and create content type. My major requirement is all the process need to be automated by cron. I tried feeds module but it can’t run with cron in Drupal 6, everytime I run cron I am getting an error as

Fatal error: Call to undefined method FeedsMissingPlugin::parse() I tried JSON feed parser module but it is giving timeout as I have large number of nodes around 6k+ nodes.

Can anyone suggest a way to achieve the task ?