Hello, first of all we are very sorry if we couldn't reach you before,
We are busy with many productions right now, we will try to speed up or reply, we may also need time to make a new big update for Shadero.
For your issue, it's appear that this will always showed when you set the shadero windows to maxime.
1 - don't use maxime windows
2 - we will fix this issue soon.
Again, sorry for all those delay.
I just went back to use this asset and voted it 5 stars, sadly the forums have no moderators.
And your error looks like a programming error, one of your scripts has set this property and it doesn't exist.