Workflow approvals in OWA 2013 - App Error something went wrong

Hi,

We are testing an attribute workflow approval. When the approver reads the message in OWA 2013, expands 'action items' we see the following error...instead of the usual 'Approve' or 'Reject' buttons. This computer does not have Outlook, so we cannot deploy the FIM add-ins and extensions...but I dont think they are required if we're just using OWA?

Thank you