error at call static method for CLRobject

[axstart]

Hi folks,
i have created a .net dll for ax, it is part of my global asambly cach, it compiles (great :-))
but at run time i get this error occur

client static boolean updateCRMfromCustTable(custTable _newCustTable, custTable _orgCustTable)
{

CrmAx.CustContainer custContainer;
CrmAx.AdresContainer adresContainer;
System.String connectionURl;

System.Collections.ArrayList errorList;
InteropPermission interopPermission;
str errorStr;
str address;
int errorCount;
int errorMax;
;

//Run on server
InteropPermission = new interoppermission(Interopkind::ClrInterop);
interoppermission.assert();
connectionURl = "http://hbd52/mscrmservices/2007/crmservice.asmx";

try
{
custContainer = CrmAx.CustContainer::GetCustContainer(_newCustTable.CRMAccountID,connectionURl); ERROR OCCUR

custContainer.set_AccountNum