Thank you a lot! This worked.
However, now I have the following errors in the NGUI actions I'm using for Playmaker.
Assets\AT1 Ngui Actions\Scripts\nguiTweenColor.cs(21,21): error CS0426: The type name 'Style' does not exist in the type 'TweenColor'
Assets\AT1 Ngui Actions\Scripts\nguiTweenColor.cs(22,21): error CS0426: The type name 'Method' does not exist in the type 'TweenColor'
Assets\AT1 Ngui Actions\Scripts\nguiTweenPosition.cs(22,24): error CS0426: The type name 'Style' does not exist in the type 'TweenPosition'
Assets\AT1 Ngui Actions\Scripts\nguiTweenPosition.cs(23,24): error CS0426: The type name 'Method' does not exist in the type 'TweenPosition'
Assets\AT1 Ngui Actions\Scripts\nguiTweenPositionAsGameobjects.cs(22,24): error CS0426: The type name 'Style' does not exist in the type 'TweenPosition'
Assets\AT1 Ngui Actions\Scripts\nguiTweenPositionAsGameobjects.cs(23,24): error CS0426: The type name 'Method' does not exist in the type 'TweenPosition'
Assets\AT1 Ngui Actions\Scripts\nguiTweenRotation.cs(20,24): error CS0426: The type name 'Style' does not exist in the type 'TweenRotation'
Assets\AT1 Ngui Actions\Scripts\nguiTweenRotation.cs(21,24): error CS0426: The type name 'Method' does not exist in the type 'TweenRotation'
Assets\AT1 Ngui Actions\Scripts\nguiTweenScale.cs(21,21): error CS0426: The type name 'Style' does not exist in the type 'TweenScale'
Assets\AT1 Ngui Actions\Scripts\nguiTweenScale.cs(22,21): error CS0426: The type name 'Method' does not exist in the type 'TweenScale'
I've reached to the publisher, but not sure if he'll answer.