COREPORTS初始化出错

我在用COREPORTS初始化的时候,抛出了System.Runtime.InteropServices.COMException，实在搞不懂原因。望高人指点，特急！！！！拜托了代码try
{
CoReports.CrDraw crdcpreport = new CoReports.CrDraw();
crdcpreport.DocumentPath = KeyValue.GetAppSetting("FormDir", "") + "111.cid";
//crdcpreport.Initialize();
intRet = crdcpreport.Initialize();
}
catch (Exception ex)
{
throw ex;
}