Problem showing aspx page converting CRM 4 code to CRM 2011

Hi,

we are converting our existing CRM 4 project to CRM 2011.We have some custom aspx pages.

For example we have employerSearch page that we designed ourselves.There is a button on the form which callsOpenEmployerSearch function. See the function below

OpenEmployerSearch = function() {

    var url = prependOrgName("/ISV/GIC/EmployerSearch/Default.aspx?orgname=" + ORG_UNIQUE_NAME); 
 
 var results = showModalDialog(url, "", "dialogHeight:580px; dialogWidth: 800px; center: 1; resizable: 0; scroll: 0; status: 0;");
    if (!results)
        return;

}

Once I click the button it gives me the follwoing error:

Could Not load file or assembly 'Microsoft.Crm.Application.Components.App

Other messages:

ErrorNumber:

Sourcefile:

/MyOrgName/ISV/GIC/EmployerSearch/Default.aspx

Requested URL:

http://MyServerName/MyOrgName/ISV/GIC/EmployerSearch/Default.aspx

Please see the below error

Any idea would be much apprecaited.

Thanks,