Errors on "Save Compaign"

Set up all secret keys, etc from Amazon Affiliate program. Got this on saving the campaign:
stdClass Object ( [OperationRequest] => stdClass Object ( [HTTPHeaders] => stdClass Object ( [Header] => stdClass Object ( [Name] => UserAgent [Value] => PHP-SOAP/5.3.27 ) ) [RequestId] => 91d3956f-f1bc-4490-9f82-a2a15f847535 [Arguments] => stdClass Object ( [Argument] => stdClass Object ( [Name] => Service [Value] => AWSECommerceService ) ) [RequestProcessingTime] => 0.007943 ) [Items] => stdClass Object ( [Request] => stdClass Object ( [IsValid] => False [ItemSearchRequest] => stdClass Object ( [BrowseNode] => 283155 [ItemPage] => 1 [Keywords] => smudge [ResponseGroup] => Array ( [0] => Small [1] => OfferSummary [2] => Images [3] => Variations [4] => VariationOffers [5] => Offers [6] => OfferFull ) [SearchIndex] => Books ) [Errors] => stdClass Object ( [Error] => stdClass Object ( [Code] => AWS.InvalidAccount [Message] => Your AccessKey Id is not registered for Product Advertising API. Please use the AccessKey Id obtained after registering at https://affiliate-program.amazon.com/gp/flex/advertising/api/sign-in.html. ) ) ) ) )
Fatal error: Uncaught exception ‘Exception’ with message ‘Invalid Request’ in /home/spirit/public_html/wp-content/plugins/prosociate-amazon/classes/ProssociateSearch.php:136 Stack trace: #0 /home/spirit/public_html/wp-content/plugins/prosociate-amazon/classes/ProssociateCampaign.php(56): ProssociateSearch->execute(‘Small,OfferSumm…’, false) #1 /home/spirit/public_html/wp-content/plugins/prosociate-amazon/classes/ProssociateCampaignController.php(124): ProssociateCampaign->search() #2 [internal function]: ProssociateCampaignController->addedit(”) #3 /home/spirit/public_html/wp-includes/plugin.php(429): call_user_func_array(Array, Array) #4 /home/spirit/public_html/wp-admin/admin.php(217): do_action(‘prosociate_page…’) #5 {main} thrown in /home/spirit/public_html/wp-content/plugins/prosociate-amazon/classes/ProssociateSearch.php on line 136

Hope this is enough to help you troubleshoot, if not, let me know what you need.

https://www.ads-software.com/plugins/prosociate-amazon/