I am using the sample charts, and I can not run the application it tells me the model element is not known. I leave the code here

<ext:Store
ID="CompanyStore"
runat="server"
Data="<%# Data %>"
AutoDataBind="true">
<Model>
<ext:Model runat="server">
<Fields>
<ext:ModelField Name="company" Mapping="Company" />
<ext:ModelField Name="price" Mapping="Price" Type="Float" />
<ext:ModelField Name="revenue" Mapping="Revenue" Type="Float" />
<ext:ModelField Name="growth" Mapping="Growth" Type="Float" />
<ext:ModelField Name="product" Mapping="Product" Type="Float" />
<ext:ModelField Name="market" Mapping="Market" Type="Float" />
</Fields>
</ext:Model>
</Model>
</ext:Store>
I must do to be able to use the model element

thanks