Widgets not loading or install

I am having issues with this plugin on 2 fresh installs on Flywheel hosting. I migrated the site to local and same issue. Uninstalled/reinstalled and still the same issue.

The plugin installs and activates normally, but the widgets don’t load or respond when clicked. New widgets can be created, but I cannot install or import widgets from the cloud.

If I double-click a widget, I get this message:
“View (addon) Error: Widget ID not given”

The Console shows this error when viewing the widgets list page:

Uncaught Error: Dropzone already attached.
    at new Dropzone (dropzone.js?ver=5.2:1040)
    at initImportAddonDialog (unitecreator_manager_actions_addons.js?ver=1.4.72:469)
    at initItems (unitecreator_manager_actions_addons.js?ver=1.4.72:187)
    at UCManagerActionsAddons.init (unitecreator_manager_actions_addons.js?ver=1.4.72:2436)
    at initManager (unitecreator_manager.js?ver=1.4.72:471)
    at UCManagerAdmin.initManager (unitecreator_manager.js?ver=1.4.72:761)
    at HTMLDocument.<anonymous> (admin.php?page=unlimitedelements:2772)
    at e (load-scripts.php?c=0&load[chunk_0]=jquery-core,jquery-migrate,utils,moxiejs,plupload&ver=5.7.2:2)
    at t (load-scripts.php?c=0&load[chunk_0]=jquery-core,jquery-migrate,utils,moxiejs,plupload&ver=5.7.2:2)

I hope you can help troubleshoot this. Thanks!