NullReferenceException after setting up this plugin

[zeeeeelda]

NullReferenceException
UnityEngine.Component.GetComponent[T] () (at /Users/bokken/build/output/unity/unity/Runtime/Export/Scripting/Component.bindings.cs:42)
Com.LuisPedroFonseca.ProCamera2D.BasePC2D.get_ProCamera2D () (at Assets/Plugins/ProCamera2D/Runtime/Code/Core/BasePC2D.cs:14)
Com.LuisPedroFonseca.ProCamera2D.BasePC2D.OnBeforeSerialize () (at Assets/Plugins/ProCamera2D/Runtime/Code/Core/BasePC2D.cs:198)

after setting up this plugin, the above error constantly pop up.

[zeeeeelda]

Also this error after each start of game:

Objects are trying to be loaded during a domain backup. This is not allowed as it will lead to undefined behaviour!

UnityEditor.Graphing.GraphObject:OnBeforeSerialize ()

[Luís Pedro Fonseca]

Hello!

Do you also have this issue on a new project? How did you import the asset?