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# MTLCommandBufferError.Code

Error codes that indicate why a GPU is unable to finish running a command buffer.

```
enum Code
```

## Topics

### Error codes

[`MTLCommandBufferError.Code.none`](/documentation/Metal/MTLCommandBufferError-swift.struct/Code/none)

An error code that represents the absence of any problems.

[`MTLCommandBufferError.Code.timeout`](/documentation/Metal/MTLCommandBufferError-swift.struct/Code/timeout)

An error code that indicates the system interrupted and terminated the command buffer before it finished running.

[`MTLCommandBufferError.Code.pageFault`](/documentation/Metal/MTLCommandBufferError-swift.struct/Code/pageFault)

An error code that indicates the command buffer generated a page fault the GPU can’t service.

[`MTLCommandBufferError.Code.notPermitted`](/documentation/Metal/MTLCommandBufferError-swift.struct/Code/notPermitted)

An error code that indicates a process doesn’t have access to a GPU device.

[`MTLCommandBufferError.Code.outOfMemory`](/documentation/Metal/MTLCommandBufferError-swift.struct/Code/outOfMemory)

An error code that indicates the GPU device doesn’t have sufficient memory to execute a command buffer.

[`MTLCommandBufferError.Code.invalidResource`](/documentation/Metal/MTLCommandBufferError-swift.struct/Code/invalidResource)

An error code that indicates the command buffer has an invalid reference to resource.

[`MTLCommandBufferError.Code.memoryless`](/documentation/Metal/MTLCommandBufferError-swift.struct/Code/memoryless)

An error code that indicates the GPU ran out of one or more of its internal resources that support memoryless render pass attachments.

[`MTLCommandBufferError.Code.deviceRemoved`](/documentation/Metal/MTLCommandBufferError-swift.struct/Code/deviceRemoved)

An error code that indicates a person physically removed the GPU device before the command buffer finished running.

[`MTLCommandBufferError.Code.stackOverflow`](/documentation/Metal/MTLCommandBufferError-swift.struct/Code/stackOverflow)

An error code that indicates the GPU terminated the command buffer because a kernel function of tile shader used too many stack frames.

[`accessRevoked`](/documentation/Metal/MTLCommandBufferError-swift.struct/Code/accessRevoked)

An error code that indicates the system has revoked the Metal device’s access because it’s responsible for too many timeouts or hangs.

[`MTLCommandBufferError.Code.internal`](/documentation/Metal/MTLCommandBufferError-swift.struct/Code/internal)

An error code that indicates the Metal framework has an internal problem.

### Deprecated

[`MTLCommandBufferError.Code.blacklisted`](/documentation/Metal/MTLCommandBufferError-swift.struct/Code/blacklisted)

A former error code that indicates the system has revoked the Metal device’s access because it’s responsible for too many timeouts or hangs.


---

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