Why do I get "Unable to find API: qos-policy-group-get-iter" when deleting a manila share on OSP12 with netapp backend ??

Issue

When deleting a manila share on OSP12 with netapp backend I get the following trace:

2019-01-10 07:56:28.010 340304 ERROR oslo_messaging.rpc.server     six.reraise(self.type_, self.value, self.tb)
2019-01-10 07:56:28.010 340304 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/manila/share/manager.py", line 2730, in delete_share_instance
2019-01-10 07:56:28.010 340304 ERROR oslo_messaging.rpc.server     share_server=share_server)
2019-01-10 07:56:28.010 340304 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/manila/share/drivers/netapp/dataontap/cluster_mode/drv_single_svm.py", line 63, in delete_share
2019-01-10 07:56:28.010 340304 ERROR oslo_messaging.rpc.server     self.library.delete_share(context, share, **kwargs)
2019-01-10 07:56:28.010 340304 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/manila/share/drivers/netapp/utils.py", line 86, in trace_wrapper
2019-01-10 07:56:28.010 340304 ERROR oslo_messaging.rpc.server     result = f(self, *args, **kwargs)
2019-01-10 07:56:28.010 340304 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/manila/share/drivers/netapp/dataontap/cluster_mode/lib_base.py", line 752, in delete_share
2019-01-10 07:56:28.010 340304 ERROR oslo_messaging.rpc.server     qos_policy_for_share)
2019-01-10 07:56:28.010 340304 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/manila/share/drivers/netapp/utils.py", line 86, in trace_wrapper
2019-01-10 07:56:28.010 340304 ERROR oslo_messaging.rpc.server     result = f(self, *args, **kwargs)
2019-01-10 07:56:28.010 340304 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/manila/share/drivers/netapp/dataontap/client/client_cmode.py", line 3622, in mark_qos_policy_group_for_deletion
2019-01-10 07:56:28.010 340304 ERROR oslo_messaging.rpc.server     if self.qos_policy_group_exists(qos_policy_group_name):
2019-01-10 07:56:28.010 340304 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/manila/share/drivers/netapp/utils.py", line 86, in trace_wrapper
2019-01-10 07:56:28.010 340304 ERROR oslo_messaging.rpc.server     result = f(self, *args, **kwargs)
2019-01-10 07:56:28.010 340304 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/manila/share/drivers/netapp/dataontap/client/client_cmode.py", line 3531, in qos_policy_group_exists
2019-01-10 07:56:28.010 340304 ERROR oslo_messaging.rpc.server     self.qos_policy_group_get(qos_policy_group_name)
2019-01-10 07:56:28.010 340304 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/manila/share/drivers/netapp/utils.py", line 86, in trace_wrapper
2019-01-10 07:56:28.010 340304 ERROR oslo_messaging.rpc.server     result = f(self, *args, **kwargs)
2019-01-10 07:56:28.010 340304 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/manila/share/drivers/netapp/dataontap/client/client_cmode.py", line 3555, in qos_policy_group_get
2019-01-10 07:56:28.010 340304 ERROR oslo_messaging.rpc.server     False)
2019-01-10 07:56:28.010 340304 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/manila/share/drivers/netapp/dataontap/client/client_base.py", line 83, in send_request
2019-01-10 07:56:28.010 340304 ERROR oslo_messaging.rpc.server     return self.connection.invoke_successfully(request, enable_tunneling)
2019-01-10 07:56:28.010 340304 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/manila/share/drivers/netapp/dataontap/client/api.py", line 274, in invoke_successfully
2019-01-10 07:56:28.010 340304 ERROR oslo_messaging.rpc.server     raise NaApiError(code, msg)
2019-01-10 07:56:28.010 340304 ERROR oslo_messaging.rpc.server NaApiError: NetApp API failed. Reason - 13005:Unable to find API: qos-policy-group-get-iter
2019-01-10 07:56:28.010 340304 ERROR oslo_messaging.rpc.server