Linq + nested GroupBy - mysql

Question

We are using mySQL with WCF Restful service, we want to fetch our database content PACKAGEID wise...as mentioned below:
PackageId=2
{
StartRange = 1;
EndRange = 100;
IsDiscountAndChargeInPer = 1;
Discount =10;
ServiceCharge = 20;![enter image description here][1]
},
{
StartRange =101;
EndRange = 500;
IsDiscountAndChargeInPer = 1;
Discount =10;
ServiceCharge = 20;
}
PackageId=3
{
StartRange = 1;
EndRange = 100;
IsDiscountAndChargeInPer = 1;
Discount =10;
ServiceCharge = 20;
}
We have created a Result class to return result from out wcf service...for above service we have result class defined as below
[DataContract]
public class PackagePointRangeConfigurationResult : ResultBase
{
[DataMember]
public List<PackagePointRangeResult> Result;
}
public class PackagePointRangeResult
{
public int PackageId { get; set; }
public List<PointPlanInfo> Result { get; set; }
}
For fetching record we use following linq query:
var result = (from planinfo in db.mst_pointplan_info
join entityType in db.mst_entity_type
on planinfo.entityId equals entityType.id
where planinfo.entityId == entityId
&& planinfo.is_deleted != true
&& planinfo.system_id == systemId
&& entityType.enity_enum_id == entityId
group planinfo by planinfo.package_id into gplan
select new PackagePointRangeConfigurationResult
{
Result = (from planinfo in gplan
select new PackagePointRangeResult
{
PackageId = planinfo.package_id,
PointPlanInfo = (from pointPlanInfo in gplan
select new PointPlanInfo
{
StartRange = planinfo.start_range,
EndRange = planinfo.end_range,
IsDiscountAndChargeInPer = planinfo.is_discount_and_charge_in_per,
Discount = planinfo.discount,
ServiceCharge = planinfo.servicecharge,
AtonMerchantShare =planinfo.aton_merchant_share,
CommunityShare = planinfo.community_share
}).ToList()
}).ToList()
}).FirstOrDefault();
But it gives me below error:
LINQ to Entities does not recognize the method 'System.Collections.Generic.List1[PointPlanInfo] ToList[PointPlanInfo](System.Collections.Generic.IEnumerable1[PointPlanInfo])' method, and this method cannot be translated into a store expression.