Getting “Error calling PA-API 5.0”

Hi, I tried to configure amazomatic in my Wordpress site. I've done everything as suggested but I'm getting the below error again and again. [26-Mar-2020 12:50:08 UTC] Error calling PA-API 5.0! [26-Mar-2020 12:50:08 UTC] HTTP Status Code: [26-Mar-2020 12:50:08 UTC] Error Message: [26-Mar-2020 12:50:08 UTC] Error Type: [26-Mar-2020 12:50:08 UTC] Error Message: [26-Mar-2020 12:50:08 UTC] Exception thrown -> ApiException occured in Amazon API.!