CRM 2011 On-Premise: MSCRMKEY Renewal failed and the transaction log for database 'MSCRM_CONFIG' is full due to 'LOG_BACKUP'

Hello

We have CRM 2011 On-Premise and I got this error when I tried to access CRM.

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I followed the below blog to renew the MSCRMKEY

https://community.dynamics.com/crm/b/crmparkinglot/archive/2015/06/30/invalid-action-the-selected-action-was-not-valid

Now I have got this error "Renewal Failed. The transaction log for database 'MSCRM_CONFIG' is full due to 'LOG_BACKUP'

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Can anyone help me with this issue please?

Thanks

Bab