---
id: declarative-mutation-directives
title: Debugging Declarative Mutation Directives
slug: /debugging/declarative-mutation-directives/
description: Debugging declarative mutation directives
keywords:
- debugging
- troubleshooting
- declarative mutation directive
- deleteRecord
- handlerProvider
- appendEdge
- prependEdge
- appendNode
- prependNode
---

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If you see an error similar to:

```
RelayFBHandlerProvider: No handler defined for `deleteRecord`. [Caught in: An uncaught error was thrown inside `RelayObservable`.]
```

or

```
RelayModernEnvironment: Expected a handler to be provided for handle `deleteRecord`.
```

This probably means that you are using a Relay environment to which a `handlerProvider` is passed. However, the handler provider does not know how to accept the handles `"deleteRecord"`, `"appendEdge"` or `"prependEdge"`. If this is the case, you should return `MutationHandlers.DeleteRecordHandler`, `MutationHandlers.AppendEdgeHandler`, or `MutationHandlers.PrependEdgeHandler` respectively (these can be imported from `relay-runtime`).

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