Sapui5 List_no_data

ı take my data from unigate to my list. When ı use on localhost and disable security, I can see my data. But when ı upload my site , It says list_no_data. How can I solve this. My list:

<List id="idList" items="{/}" >
        <items>
           <CustomListItem>
              <content>
                <Panel expandable="true" expanded="true" headerText="{Name}" >
                  <FlexBox alignItems="Center" justifyContent="Center" direction="Column">
                    <items>
                    <FlexBox >
                    <Text text="Ad:"></Text><Text text="{Name}" ></Text>
                    </FlexBox>
                    <FlexBox> <Text text="Soyad:"></Text><Text text="{Surname}"></Text></FlexBox>     
                   <FlexBox><Text text="E-mail:"></Text><Text text="{EMail}"></Text></FlexBox>    
                    </items>
                </FlexBox>
                   </Panel>
             </content>
            </CustomListItem> 
            </items>
          </List>

My js file.

 var view = this.getView();
 var model = new sap.ui.model.json.JSONModel();
 model.loadData("xxxx");        
 view.setModel(model)   ;