Change permissions once create dynamic content

Hi all,

I want custom permissions for dynamic content once created. I used IDynamicContentCreatedEvent but when login with an account custom role (not administrator), I can't create dynamic. In CMS show "Database error". Anyone help me fix this issue.

This is my code

public static void DynamicContentCreatedEventHandler(IDynamicContentCreatedEvent eventInfo)
{
    DynamicContent dynamicContentItem = eventInfo.Item;
    try
    {
        var providerName = String.Empty;
        var transactionName = "someTransactionName";
        DynamicModuleManager manager = DynamicModuleManager.GetManager(providerName, transactionName);
        var hospitalitem = dynamicContentItem.GetRelatedItems("hospital").FirstOrDefault() as DynamicContent;
        string roles = "Role1,Role2,Role3";
        if (dynamicContentItem != null)
        {
            dynamicContentItem.ManagePermissions().ClearAll();

            if (!string.IsNullOrEmpty(roles))
            {
                var roleArray = roles.Split(',');
                var roleManager = RoleManager.GetManager();
                foreach (var role in roleArray)
                {
                    var roleExists = roleManager.RoleExists(role);
                    var roleItem = roleManager.GetRole(role);
                    if (roleExists)
                    {
                        try
                        {
                            dynamicContentItem.ManagePermissions()
                              .ForRole(roleItem.Id)
                              .Grant()
                              .View();

                            dynamicContentItem.ManagePermissions()
                              .ForRole(roleItem.Id)
                              .Grant()
                              .Delete();
                            dynamicContentItem.ManagePermissions()
                              .ForRole(roleItem.Id)
                              .Deny()
                              .ChangePermissions();
                            dynamicContentItem.ManagePermissions()
                              .ForRole(roleItem.Id)
                              .Deny()
                              .ChangeOwner();
                            dynamicContentItem.ManagePermissions()
                              .ForRole(roleItem.Id)
                              .Grant()
                              .Modify();
                            dynamicContentItem.ManagePermissions()
                              .ForRole(roleItem.Id)
                              .Deny().
                              Create();
                        }
                        catch (Exception ex)
                        {
                            Log.Write(ex.ToString());
                        }
                    }
                }
            }
        }
    }
    catch (Exception ex)
    {
        Log.Write(ex.ToString());
    }
}