Uh, we don't have Core Script 1.8.0. Core Engine v1.6.1 is the most recent version to date. Unless you happen to be from the future ....
In any case, would you be able to share screencaps of the following so we can help diagnose the issue?
- Plugin Manager for your Project
- Plugin Parameters for Deck Editor plugin
- Event/Script Call where you are trying to Open the Library
- Img/System Folder for your Project
Once we have these we will have a better idea of what is going on and be able to troubleshoot further.