# Error Codes
Here is a list of common Shopify errors and common solutions. If you have any questions, please don't hesitate to contact MESA support.
| 400 Bad Request | The request was not understood by the server, generally due to bad syntax or because the `Content-Type` header was not correctly set to `application/json`.This status is also returned when the request provides an invalid `code` parameter during the [OAuth](https://shopify.dev/apps/auth/oauth) token exchange process. |
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| 401 Unauthorized | The necessary authentication connections are not present in the request or are incorrect.
Solution: Double-check your connection and replay the automation.
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| 402 Payment Required | The requested shop is currently frozen. The shop owner needs to log in to the shop's admin and pay the outstanding balance to unfreeze the shop. |
| 403 Forbidden | The server is refusing to respond to the request. This is generally because you have not requested the appropriate scope for this action.
Solution: Double-check your connection and replay the automation.
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| 404 Not Found | The requested resource was not found but could be available again in the future.
Solution: Verify that the ID you are passing is correct and exists.
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| 406 Not Acceptable | The requested resource is only capable of generating content not acceptable according to the Accept headers sent in the request. |
| 422 Un-processable Entity | The request body was well-formed but contains semantic errors. A 422 error code can be returned from a variety of scenarios including, but not limited to:
- Incorrectly formatted input
- Checking out products that are out of stock
- Canceling an order that has fulfillments
- Creating an order with tax lines on both line items and the order
- Creating a customer without an email or name
- Creating a product without a title
The response body provides details in the errors or error parameters.
Solution: Check that your configuration is correct and replay the automation.
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| 423 Locked | The requested shop is currently locked. Shops are locked if they repeatedly exceed their API request limit, or if there is an issue with the account, such as a detected compromise or fraud risk. [Contact Shopify support](https://help.shopify.com/en/questions#/contact) if your shop is locked. |
| 429 Too Many Requests | The request was not accepted because the application has exceeded the rate limit. Learn more about Shopify’s API rate limits.
Solution: Try using a Shopify Custom App MESA connection or replay the automation when there is less activity on your store.
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| 500 Internal Server Error | An internal error occurred in Shopify. Please post in the Shopify APIs and SDKs forum so that Shopify staff can investigate.
Solution: Please replay your automation or contact Shopify for their staff to investigate.
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| 501 Not Implemented | The requested endpoint is not available on that particular shop, e.g. requesting access to a Shopify Plus–only API on a non-Plus shop. This response may also indicate that this endpoint is reserved for future use.
Solution: Try using a Shopify Custom App MESA connection that has access to Plus-only APIs.
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| 503 Service Unavailable | The server is currently unavailable. Check the Shopify status page for reported service outages.
Solution: Replay this automation.
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| 504 Gateway Timeout | The request could not complete in time. Shopify waits up to 10 seconds for a response. Try breaking it down in multiple smaller requests.
Solution: Try restructuring your MESA workflow to break it down into smaller parts. Reach out to MESA support if you have any questions.
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