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When creating an NFS export in ceph-dashboard, if we unselect the NFSv3 checkbox (selected by default) and then save the export we get the following frontend error message:

Failed to create NFS '_default_:/'
create() got an unexpected keyword argument 'protocolNfsv3'

and in the backend log we get:

2019-03-28 09:22:10.772 7f210ff91700  0 mgr[dashboard] Error while calling Task(ns=nfs/create, md={'path': '/', 'fsal': 'CEPH', 'cluster_id': '_default_'})
Traceback (most recent call last):
  File "/usr/share/ceph/mgr/dashboard/tools.py", line 540, in _run
    val = self.task.fn(*self.task.fn_args, **self.task.fn_kwargs)
TypeError: create() got an unexpected keyword argument 'protocolNfsv3'

The json input that is sent in the POST http request is this:

{
  "cluster_id":"_default_",
  "daemons":["node2"],
  "fsal": {
    "name":"CEPH",
    "user_id":"admin",
    "fs_name":"cephfs",
    "sec_label_xattr":null
  },
  "path":"/",
  "protocolNfsv3":false,
  "tag":null,
  "pseudo":"/cephfs",
  "access_type":"RW",
  "squash":"no_root_squash",
  "clients":[],
  "security_label":false,
  "protocols":[4],
  "transports":["TCP","UDP"]
}