S7 connection - get_gameObject can only be called from the main thread.

Hi, 

When trying to make an S7 connection (new empty scene) in the realvirtual.IO starter kit I have following issue.
The connection is OK and running in Scene mode, but once in Game mode, I see I have following error:

Connection failed: get_gameObject can only be called from the main thread.
Constructors and field initializers will be executed from the loading thread when loading a scene.
Don't use this function in the constructor or field initializers, instead move initialization code to the Awake or Start function. 

In the connection view of TIA portal I see a lot of connection active.

Does anyone has any advise on how to solve this?

Unity version 

siemens CPU 1515-2-PN

Connection failed: get_gameObject can only be called from the main thread.
Constructors and field initializers will be executed from the loading thread when loading a scene.
Don't use this function in the constructor or field initializers, instead move initialization code to the Awake or Start function.