c# - IPP .NET 3.0 SDK Migration Issue: "Could not load type 'Intuit.Ipp.Core.Rest.SyncRestHandler'" -

i'm receiving following error when try create dataservice object. swapped out 2.0 sdk 3.0 , made adjustments detailed in docs. not sure what's going on though. ideas?

"could not load type 'intuit.ipp.core.rest.syncresthandler' assembly 'intuit.ipp.core, version=2.1.7.0, culture=neutral, publickeytoken=null'"

oauthrequestvalidator oauthvalidator =  new oauthrequestvalidator(quickbookstoken,                            quickbookssecrettoken,                            quickbooksconsumerkey,                            quickbooksconsumersecret);  servicecontext context =  new servicecontext(oauthvalidator, quickbooksrealm, intuitservicestype.qbo);  //blows here            dataservice commonservice = new dataservice(context); 

same issue me, , appears working making dataservice plural:

dataservices commonservice = new dataservices(context); 

unfortunately, has issue bit further on , limits functionality. example, have errors when attempting use query service, apparently expects dataservice (singular).

method not found: 'void intuit.ipp.core.servicecontext.usedataservices()'. 

if can find real answer, post here...

update:

i made new bin/ folder, added new sdk dll files , copied whatever else needed (dotnetoauth etc,). minor changes code, , viola, works.

oauthrequestvalidator oauthvalidator = new oauthrequestvalidator(accesstoken, accesstokensecret, consumerkey, consumersecret);  servicecontext context = new servicecontext(realmid, intuitservicestype.qbo, oauthvalidator);  dataservice commonservice = new dataservice(context);