[flexcoders] combo box and xml error in flex

[Deniz Davutoglu]

Hello, I am new in flex  and I try to get data from server.  When it
contains just one node in xml like this
<rotaters>
   <rotater>
     <id>30</id>
     <name>sdf sdf sd</name>
     <size>120x300</size>
  </rotater>
</rotaters>
it cast this error :
Error #1034: Type Coercion failed: cannot convert
mx.utils::[EMAIL PROTECTED] to mx.collections.ArrayCollection.
when data retrived from database contains more then one rotater
element it work and dont cast any error.
<rotaters>
   <rotater>
     <id>30</id>
     <name>sdf sdf sd</name>
     <size>120x300</size>
  </rotater>
   <rotater>
    <id>42</id>
    <name>dfgdfg</name>
    <size></size>
  </rotater>
</rotaters>

also I have problem with retrieving data from combo when I try to save
combo box label data

        <mx:ComboBox width="160" x="54" y="70" enabled="true"
id="rotaterSize">
       <mx:ArrayCollection>
         <mx:Object label="468x60"/>
         <mx:Object label="728x90"/>
         <mx:Object label="120x300"/>
         <mx:Object label="120x600"/>
      </mx:ArrayCollection>
    </mx:ComboBox>
it cant retrive value of second element(728x90) exept it all of them
are retrieved.

Thanks
Deniz