# Validation failure error codes in Amazon EMR
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The following sections provide troubleshooting information for validation failure error codes.

**Topics**
+ [VALIDATION\_ERROR\_SUBNET\_NOT\_FROM\_ONE\_VPC](VALIDATION_ERROR_SUBNET_NOT_FROM_ONE_VPC.md)
+ [VALIDATION\_ERROR\_SECURITY\_GROUP\_NOT\_FROM\_ONE\_VPC](VALIDATION_ERROR_SECURITY_GROUP_NOT_FROM_ONE_VPC.md)
+ [VALIDATION\_ERROR\_INVALID\_SSH\_KEY\_NAME](VALIDATION_ERROR_INVALID_SSH_KEY_NAME.md)
+ [VALIDATION\_ERROR\_INSTANCE\_TYPE\_NOT\_SUPPORTED](VALIDATION_ERROR_INSTANCE_TYPE_NOT_SUPPORTED.md)