Hi there!
I see! Thanks for the feedback! I did some investigation and it was my bad. The plugin parameter "Resolution list" under the ScreenManager plugin has a wrong default value.
Please open it, remove the commas, and set each resolution on each line. When you open, each should look like this:
Change to this:
I will update the plugin too! But since you already have it on your project, you may need to change that parameter.