Switch from Asp.net Rc1 to Rtm throws exception that i dont understand -

i made new project in rtm , transferred code project. got far don’t errors in vs. when try start iis error:

could not load file or assembly 'system.interactive.async, version=3.0.0.0,culture=neutral, publickeytoken=94bc3704cddfc263'. located assembly's manifest definition not match assembly reference. (exception hresult: 0x80131040) 

it happens when dbcontext created iservicecollection.

any idea cause it?

sorry i’m not posting code don’t know start because don’t understand error. if want see code ask.

1. it seems 3rd-party libraries use not upgraded/compatible rtm. check non-microsoft dependencies in project.json

2. also, read upgrade guide carefully: migrating asp.net 5 rc1 asp.net core 1.0