# Error codes ### 400 Bad Request You may receive a `400 Bad Request` when:‌ #### There are issues in the body of your request * You are missing required fields. ```json "information": { "addresses": ["This field is required."] } ``` **How to fix this issue** Add all the required fields to the body of your request. * You used the wrong format or data type for a field. ```json "city": ["Not a valid string."] ``` **How to fix this issue** Format all your fields according to their [data type](https://www.w3schools.com/js/js_json_datatypes.asp). #### There's an issue with your account * Your account isn't configured to run this check. ```json "request_equifax": ["Account not configured to \"request_equifax\". Please contact support@certn.co to update your plan."] ``` **How to fix this issue** [Contact our support team](/api/certn-api-v-1.0/contact.md#api) to have your account configured for this check. #### Something is preventing your request from completing * You tried to generate a report, but the application is still processing. ```json "non_field_errors": ["Cannot generate report for incomplete hr applicant."] ``` **How to fix this issue** Wait for the application's `status` field to show `Returned` before generating the final report. * You requested a check with a `min` and a `max` but set your `min` value to a number greater than your `max` value. ```json "non_field_errors": [ "employer_references_max must be greater than employer_references_min." ] ``` **How to fix this issue** Edit the request's check settings to make sure that any min values are less than or equal to the corresponding max values. ### 401 Unauthorized You may receive a `401 Unauthorized` if:‌ #### Your authorization header is missing or incorrect * You sent your request without an authorization header. ```json "detail": "Authentication credentials were not provided." ``` * You sent your request with an authorization header, but without an API Key. * You provided an incorrect API key in the header of your request. ```json "detail": "Invalid token." ``` **How to fix this issue** Add an [authorization header](/api/certn-api-v-1.0/guides/use-the-api/authorization-header.md) to your request, and make sure it includes your API Key. ### 403 Forbidden You may receive a 403 Forbidden if: #### You don't have permission to make this request * You sent your request to an endpoint you don't have access to. ```json "detail": "You do not have permission to perform this action." ``` **How to fix this issue** Use the URL that corresponds to your industry, and make sure you're authorized to access this endpoint. ### 404 Not found You may receive a `404 Not found` if:‌ #### The resource you called doesn't exist * You sent a request to retrieve all your applications, but the page number you provided doesn't exist. ```json "detail": "Invalid page." ``` **How to fix this issue** Make sure the page number you entered is a valid integer and within the bounds of your expected results. * You sent a request to retrieve an application or a report, but the application ID you provided couldn't be found. ```json "detail": "Not found." ``` * You sent a request to retrieve an application or a report, but the application ID you provided is a string of letters. ```html NOT FOUND ``` **How to fix this issue** Add your [application ID](/api/certn-api-v-1.0/getting-started/demo-account/retrieve-results.md#send-the-request) to the URL and make sure it's in the proper format. * You sent a request to retrieve questionnaire reference templates for a team, but the team ID you provided couldn't be found. ```json "detail": "Not found." ``` * You sent a request to retrieve questionnaire reference templates for a team, but the team ID you provided is a string of letters. ```html NOT FOUND ``` **How to fix this issue** Add your team ID to the URL and make sure it's in the proper format. ### 500 Internal Server Error You may receive a `500 Internal Server Error` when:‌ #### You sent something we didn't expect * Some fields in your request are using the wrong data type. ```html Server Error (500) ``` **How to fix this issue** Format all your fields according to their [data type](https://www.w3schools.com/js/js_json_datatypes.asp). Most fields in our API take strings, while [request flags](/api/certn-api-v-1.0/api-reference/resources/application-parameters/request-flags.md) take booleans.