The blender bridge depends on the external python module Pillow for image conversion, which can in some cases cause issues with the installation to which most major bugs can be traced back.
Fresh install
If you install a version of the bridge for the first time and it doesn't work after starting Blender a second time after activating the addon, look in the addons folder (".../AppData/Roaming/Blender Foundation/Blender/x.x/scripts/addons/") and check if you have a "modules" folder with "PIL" in it. If not, make sure you have a working internet connection and look at blender's output log (run blender.exe instead of blender-launcher.exe). Blender should be downloading a python package via pip.
Updated Blender version
If you've upgraded to a new version of Blender and selected "Load x.x settings" in the initial screen of the new version after the first start, and you had the World Creator bridge installed in the other version of Blender, make sure you delete the "PIL" and "pillow...." folders in ".../AppData/Roaming/Blender Foundation/Blender/x.x/scripts/addons/" and reinstall the World Creator bridge, as the old bridge will be copied over when you transfer its settings, which can mess up Pillow.
If you've tried these steps and still have issues post it in the corresponding channel on the World Creator discord server or contact the support.