Open cart & rapid picture uploader producing errors.

[RimBlock]

Hi,

I have been working on an OpenCart site for a bit now and have added the inport / export module inc manually modifying the various files required and it all works great.

I came across the Rapid Image Uploader module for uploading multiple pictures including auto resize for products but am having a few issues. I have downloaded and extracted to the folders on my hosting service but I am getting PHP errors now. I have not edited any files manually as I have not seen any instructions telling me to do so.

The errors are;

2012-01-26 14:39:31 - PHP Notice:  Uninitialized string offset: 0 in  /var/sites/s/[MY WEBSITE]/public_html/admin/model/catalog/product.php on  line 198
2012-01-26 14:39:31 - PHP Warning:  Cannot modify header information -  headers already sent by (output started at /var/sites/s/[MY  WEBSITE]/public_html/admin/index.php:79) in /var/sites/s/[MY  WEBSITE]/public_html/system/engine/controller.php on line 28
2012-01-26 14:39:31 - PHP Warning:  Cannot modify header information -  headers already sent by (output started at /var/sites/s/[MY  WEBSITE]/public_html/admin/index.php:79) in /var/sites/s/[MY  WEBSITE]/public_html/system/engine/controller.php on line 29
2012-01-26 14:53:42 - PHP Notice:  Error: Could not load library json!  in /var/sites/s/[MY WEBSITE]/public_html/system/engine/loader.php on  line 23

Any ideas on how best to fix. I can export my settings etc and start fresh but if there is a fairly easy fix or there is something I have missed then I would prefer to correct than restart. The site is not yet live so downtime is not an issue.

Thanks
RB