i got this error

Mediachase.Store.Business.StoreException: User: Anonymous, Url: /ecf3/CommerceManager/MasterTemplate.aspx?template=Amazing, DataBinding: 'MetaBuilders.WebControls.MasterPages.Region' does not contain a property with the name 'MasterTemplateInfo'. at System.Web.UI.DataBinder.GetPropertyValue(Object container, String propName) at System.Web.UI.DataBinder.Eval(Object container, String[] expressionParts) at System.Web.UI.DataBinder.Eval(Object container, String expression) at ASP.module_adminmastertemplate_ascx.__DataBind__control2(Object sender, EventArgs e) in c:\Program Files\Mediachase\eCommerce Framework 3.1\eCFCommerceManager\Module\AdminMasterTemplate.ascx:line 15 at System.Web.UI.Control.OnDataBinding(EventArgs e) at System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) at System.Web.UI.Control.DataBind() at System.Web.UI.Control.DataBindChildren() at System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) at System.Web.UI.Control.DataBind() at Mediachase.Store.Web.Admin.Module.AdminMasterTemplate.Page_Load(Object sender, EventArgs e) at System.Web.UI.Control.OnLoad(EventArgs e) at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

so how i can solve it?????????

Which version of the Trial are you using?  Is it the latest 3.1.2? 

What types of modifications did you make after you installed the base installation?

Can you send us a screenshot of the full error or you can post the whole page you get when this error happens.

PS: i think you are using ASP.NET 2.0 to run ECF 3, which it won't do.