Fluent nHibernate Mapping issue - nhibernate

Question

I have a DB with the following tables
Users
Roles
UserInRoles (Bridge table for Users and Roles for many to many relationship
Modules
ModulePermission (this include the PK of Roles and modules and a bool field to identify the role has permission to access the module or not
now i m confuse about the Mapping of these table in fluent nHibernate, i did the mapping as define in Fluent nHibernate Wiki site but getting this error:
(XmlDocument)(3,6): XML validation
error: The element 'composite-id' in
namespace 'urn:nhibernate-mapping-2.2'
has incomplete content. List of
possible elements expected: 'meta,
key-property, key-many-to-one' in
namespace
'urn:nhibernate-mapping-2.2'.
Mapping:
UserMap:
public class UserMap : ClassMap<User>
{
public UserMap()
{
Table("tblUsers");
LazyLoad();
Id(user => user.UserID).GeneratedBy.GuidComb();
Map(user => user.UserName).Not.Nullable();
Map(user => user.Password).Not.Nullable();
Map(user => user.IsActive).Nullable();
HasManyToMany(user => user.RolesOfUser).Cascade.All().Inverse().Table("UserInRoles");
}
}
RoleMap:
public class RoleMap : ClassMap<Role>
{
public RoleMap()
{
Table("tblRoles");
Id(role => role.RoleID).GeneratedBy.Identity();
Map(role => role.RoleName).Not.Nullable();
Map(role => role.IsActive).Not.Nullable();
Map(role => role.Description).Not.Nullable();
HasManyToMany(role => role.Users).Cascade.All().Table("UserInRoles");
}
}
Does anyone know what is the issue?
Thanks

Answer 1

HasManyToMany mapping configuration worked for me when I defined Parent and Child Key Column. You can do it like this:
HasManyToMany(user => user.RolesOfUser)
.Table("UserInRoles")
.ParentKeyColumn("UserID")
.ChildKeyColumn("RoleID");