BdcException: The shim execution failed unexpectedly

gistfile1.cs

using (var site = new SPSite("http://localhost"))
{
    // Get context for the site.
    var context = SPServiceContext.GetContext(site);    
            
    // Assign context in SPServiceContext.Current
    using (var scope = new SPServiceContextScope(context))
    {
        ...
        entity.FindFiltered(...);
    }            
}