[Solved] IAP error message after update to the newest IAP version.

Using Unity 2017.1.2.f1 (and checked with Unity 2017.2.0.f3 - issue still present) on Mac High Sierra
I am not able to use IAP in my mobile game at all after update to the newest IAP library using Services tab.
The error which is present in the log is:

FileNotFoundException: Could not load file or assembly 'Common, Version=1.0.6212.28264, Culture=neutral, PublicKeyToken=null' or one of its dependencies.
UnityEngine.Purchasing.UnityPurchasingEditor.RefreshCheckmarks ()
UnityEngine.Purchasing.UnityPurchasingEditor.<UnityPurchasingEditor>m__0 ()
UnityEditor.EditorApplication.Internal_CallDelayFunctions () (at /Users/builduser/buildslave/unity/build/Editor/Mono/EditorApplication.cs:118)

Do you have any idea how to workaround this issues?

 

Please try to Reimport the IAP plugin from the Services window, and choose Yes if it prompts you to upgrade the API.

 

Unfortunately, it did not work for me, I reimported, upgraded but the error still occurs.

 

Are you able to reproduce with a new/empty project, and add Unity IAP?

 

IAP for new project is working so I came up to a solution - I have created an empty project and clear up my current project - remove library and unity plugins folder as well as UnityConnectService.assets than I configured IAP via Services tab (at this moment I still could not run game because of IAP errors) however when I replaced unity plugins folder with this new one created for the empty project than error disappeared miraculously and... I can run everything as there was no problem at all.