> ## Documentation Index > Fetch the complete documentation index at: https://docs.landing.ai/llms.txt > Use this file to discover all available pages before exploring further. # Troubleshoot Classification export const classify = 'ADE Classify'; export const splitJSON = 'split rules'; export const split = 'ADE Split'; export const adePythonLibrary = 'ade-python'; export const dpt2mini = 'DPT-2 mini'; export const dpt2 = 'DPT-2'; export const dpt1 = 'DPT-1'; export const dpt = 'Document Pre-Trained Transformer'; export const companyName = 'LandingAI'; export const extract = 'ADE Extract'; export const parse = 'ADE Parse'; export const ade = 'Agentic Document Extraction'; Use this section to troubleshoot issues encountered when calling the [{classify}](https://docs.landing.ai/api-reference/tools/ade-classify) API. ## Common Status Codes | Status Code | Name | Description | What to Do | | ----------- | ---------------------- | ----------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------- | | 200 | Success | Classification completed successfully. | Continue with normal operations. | | 400 | Bad Request | Invalid request parameters. | Review the error message. See [Status 400](#status-400-bad-request). | | 401 | Unauthorized | Missing or invalid API key. | Check that your API key header is present and contains a valid [API key](./agentic-api-key). | | 402 | Payment Required | Your account does not have enough credits to complete processing. | If you have multiple accounts, make sure you're using the correct [API key](./agentic-api-key). Add more credits to your account. | | 413 | Content Too Large | The document exceeds the 200 MB size limit. | Reduce the file size and retry. See [Status 413](#status-413-content-too-large). | | 415 | Unsupported Media Type | The document could not be read or converted. | Convert the document to PDF and retry. See [Status 415](#status-415-unsupported-media-type). | | 422 | Unprocessable Entity | Input validation failed. | Review your request parameters. See [Status 422](#status-422-unprocessable-entity). | | 429 | Too Many Requests | Rate limit exceeded. | Wait before retrying. Reduce request frequency and implement exponential backoff. | | 500 | Internal Server Error | Server error during classification. | Retry. If the issue persists, contact [support@landing.ai](mailto:support@landing.ai). See [Status 500](#status-500-internal-server-error). | | 502 | Bad Gateway | The classification service returned an error. | Retry. If the issue persists, contact [support@landing.ai](mailto:support@landing.ai). See [Status 502](#status-502-bad-gateway). | | 504 | Gateway Timeout | Request processing exceeded the timeout limit. | Reduce document size or number of pages. See [Status 504](#status-504-gateway-timeout). | ## Status 400: Bad Request This status code indicates invalid request parameters or client-side errors. Review the specific error message to identify the issue. ### Error: Invalid document URL This error occurs when the URL provided in `document_url` cannot be fetched. The URL may be invalid, unreachable, or return a non-200 response. **What to do:** * Verify the URL is correct and publicly accessible. * Confirm the server hosting the document does not require authentication or block external requests. * If the document is behind a firewall or requires credentials, download it locally and upload it using the `document` parameter instead. ## Status 413: Content Too Large This error occurs when the document you submit exceeds the 200 MB file size limit. **What to do:** * Reduce the file size before uploading. * If the document is a PDF, consider compressing it or splitting it into smaller files before classifying. ## Status 415: Unsupported Media Type This error occurs when a document in a supported office format (such as DOCX or PPTX) could not be converted to PDF for processing. This is a server-side conversion failure, not a format restriction. **What to do:** * Convert the document to PDF before uploading and retry. * If the error persists, contact [support@landing.ai](mailto:support@landing.ai). ## Status 422: Unprocessable Entity This status code indicates input validation failures. Review the error message and adjust your request parameters. ### Error: Unsupported file format This error occurs when you submit a file type that the {classify} API does not support. **What to do:** * Convert your document to a supported format before calling the API. * For supported file formats, see [Supported File Types](./ade-classify#supported-file-types). ### Error: Both document fields provided This error occurs when you include both `document` and `document_url` in the same request. **What to do:** * Include only one document input per request: either upload a file using `document` or provide a URL using `document_url`. ## Status 500: Internal Server Error This error indicates an unexpected server error occurred during classification. **What to do:** * Retry the request. * If the error persists, contact [support@landing.ai](mailto:support@landing.ai). ## Status 502: Bad Gateway This error occurs when the internal classification service fails to process the document, typically due to a transient error in the LLM service. **What to do:** * Retry the request. * If the error persists, contact [support@landing.ai](mailto:support@landing.ai). ## Status 504: Gateway Timeout This error occurs when the classification process exceeds the timeout limit. **What to do:** * Reduce the size of your document or the number of pages being classified. * If the error persists, contact [support@landing.ai](mailto:support@landing.ai). ## When Are Credits Consumed? Credits are consumed only when the {classify} API returns a 200 status code. All other responses, including errors, do not consume credits.