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The issue of service account lookup error in role binding can be resolved by following the below steps:

1. Check that the service account and the role binding exist in the same namespace.
2. Check that the service account specified in the role binding exists.
3. Check whether the service account in the role binding has permissions to access the Kubernetes API resources.
4. Ensure that the Kubernetes API resources specified in the role binding exist.
5. Check whether the service account in the role binding is correctly specified, with the correct name and namespace.
6. Check that the cluster is running and is accessible.
7. If the issue persists, try deleting and recreating the role binding.
8. Ensure that RBAC authorization is enabled.

If the issue persists, try to get help from the Kubernetes community or seek the assistance of a Kubernetes expert.