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Hi,
I’m trying to upgrade my Neptune DB engine version,
But I have this error:
```Failed to modify Neptune Cluster (xxxxxx): InvalidParameterCombination: The current DB instance parameter group xxxxinstanceparametergroupxxxxx is custom. You must explicitly specify a new DB instance parameter group, either default or custom, for the engine version upgrade.
	status code: 400, request id: ba8c9fb9-a3bc-43a5-bca9-20324bca10c3```
I specified the parameter group explicitly, so I don’t understand what I am missing
What am I doing wrong?
Thanks