Inserting Records into Zoho causes Fatal Error

Inserting Records into Zoho causes Fatal Error

hey there,
I've been hitting a wall for the past 2 days on this and finally reaching out for some support. I'm using the PHP SDK and attempting to Insert a Specific Record into the Contacts Module. 

I get a PHP Fatal Error:
  1. [24-Feb-2019 22:29:49 UTC] PHP Fatal error:  Uncaught Error: Call to a member function getEntityId() on array in /app/public/wp-content/plugins/nano-wc-zoho-integration/vendor/zohocrm/php-sdk/src/com/zoho/crm/library/api/handler/MassEntityAPIHandler.php:34
  2. Stack trace:
  3. #0 /app/public/wp-content/plugins/nano-wc-zoho-integration/vendor/zohocrm/php-sdk/src/com/zoho/crm/library/crud/ZCRMModule.php(952): MassEntityAPIHandler->createRecords(Array, NULL)
  4. #1 /app/public/wp-content/plugins/nano-wc-zoho-integration/includes/class-nano-wc-zoho.php(256): ZCRMModule->createRecords(Array)
  5. #2 /app/public/wp-content/plugins/nano-wc-zoho-integration/includes/class-nano-wc-zoho.php(178): Nano_WC_Zoho->insert_into_zoho('Contacts', Array)
  6. #3 /app/public/wp-includes/class-wp-hook.php(286): Nano_WC_Zoho->nano_add_contact_to_zoho('')
  7. #4 /app/public/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(NULL, Array)
  8. #5 /app/public/wp-includes/plugin.php(465): WP_Hook->do_action(Array)
  9. #6 /app/public/wp-settings.php(374): do_action('plugins_loaded')
  10. #7 /app/public/wp-config in /app/public/wp-content/plugins/nano-wc-zoho-integration/vendor/zohocrm/php-sdk/src/com/zoho/crm/library/api/handler/MassEntityAPIHandler.php on line 34
Here's my Records Array:
  1. $records = array(
  2.    'data' => array([
  3.      'Last_Name' => 'Lastname',
  4.      'Email' => 'demo@email.com',
  5.    ])
  6. );
And my call to the API:
  1. $zcrmModuleInstance = ZCRMModule::getInstance('Contacts');
  2. $apiResponse = $zcrmModuleInstance->createRecords($records);

  4. $results = $apiResponse->getEntityResponses();
  5. foreach($results as $result) {
  6.   error_log('Status: '. $result->getStatus());
  7. }
I've tried converting the $records array into json. Tried casting to an Object. 
Any help would be greatly appreciated! FWIW - I am able to search my Zoho CRM account and it works perfectly indicating no oAuth issues.