Attempted to handle event `loadedData` on while in state rootState.loaded.updated.uncommitted. Called with undefined

I am using ember-data to fetch json response from server side, my embeer model looks like.

App.Field = DS.Model.extend
  component: DS.attr 'string'
  fieldinfos: DS.hasMany('App.Fieldinfo')

App.Field.reopenClass
  forInstitution: (institution)->
    App.Field.find { institution_id: institution.id }

and my json response looks like

{
    :login_fields => [
        [0] {
                :component => "ns4:FieldInfoComponent",
                       :id => 1,
            :fieldinfo_ids => [
                [0] 1
            ]
        },
        [1] {
                :component => "ns4:FieldInfoComponent",
                       :id => 2,
            :fieldinfo_ids => [
                [0] 2
            ]
        },
        [2] {
                :component => "ns4:FieldInfoComponent",
                       :id => 3,
            :fieldinfo_ids => [
                [0] 3
            ]
        }
    ],
      :fieldinfos => [
        [0] {
            :field_info_obj => "FieldInfoSingle",
            :login_field_id => 1,
                        :id => 1,
               :element_ids => [
                [0] 1
            ]
        },
        [1] {
            :field_info_obj => "FieldInfoSingle",
            :login_field_id => 2,
                        :id => 2,
               :element_ids => [
                [0] 2
            ]
        },
        [2] {
            :field_info_obj => "FieldInfoSingle",
            :login_field_id => 3,
                        :id => 3,
               :element_ids => [
                [0] 3
            ]
        }
    ],
        :elements => [
        [0] {
                    :name => "OPTION",
            :display_name => "Select Login Preference",
                    :type => "OPTIONS",
                 :options => [
                [0] {
                    :label => "SSN (only if no username)",
                    :value => "SSN"
                },
                [1] {
                    :label => "Username",
                    :value => "UNAME"
                }
            ],
            :fieldinfo_id => 1,
                      :id => 1
        },
        [1] {
                       :name => "PASSWORD",
               :display_name => "SSN/USERNAME",
                       :type => "PASSWORD",
            :value_identifer => "PASSWORD",
                       :size => "20",
                  :maxlength => "40",
               :fieldinfo_id => 2,
                         :id => 2
        },
        [2] {
                       :name => "PASSWORD1",
               :display_name => "PASSWORD",
                       :type => "PASSWORD",
            :value_identifer => "PASSWORD1",
                       :size => "20",
                  :maxlength => "40",
               :fieldinfo_id => 3,
                         :id => 3
        }
    ]
}

it works perfectly when I call once App.Field.find { institution_id: 1 }

but in between if I again call for different institution App.Field.find { institution_id: 2 }

It gives me Attempted to handle event loadedData on while in state rootState.loaded.updated.uncommitted. Called with undefined error

what I am doing wrong over here and what I need to do to resolve this error. help!