Juniper unable to commit due to "https Missing mandatory statement: local-cert..."

Hi, I need to delete this command on Juniper device but I'm having this error message when saving.

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- Command to delete

#del system services web-management https local-certificate cert.x

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when I issue commit check , I'm having the below error message, anyone has ever encountered this?

[edit system services web-management]

'https'

Missing mandatory statement: 'local-certificate' or 'pki-local-certificate' or 'system-generated-certificate'

error: configuration check-out failed: (missing statements)

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Thanks