# Error message when you update the `desiredvCpus` setting
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You see the following error message when you use the Amazon Batch API to update the desired vCPUs (`desiredvCpus`) setting.

`Manually scaling down compute environment is not supported. Disconnecting job queues from compute environment will cause it to scale-down to minvCpus`.

This issue occurs if the updated `desiredvCpus` value is less than the current `desiredvCpus` value. When you update the `desiredvCpus` value, both of the following must be true:
+ The `desiredvCpus` value must be between the `minvCpus` and `maxvCpus` values.
+ The updated `desiredvCpus` value must be greater than or equal to the current `desiredvCpus` value.