URL Broken in Plugin

When trying to use any of the content types, the “Loading please wait” indicator doesn’t go away. It looks like the actual domain is being stripped out of the request for the tools. This is a part of the console output. All other messages are the same, but for different files.

jquery.js?ver=1.16.1:2 
 
 GET https://wp-content/uploads/h5p/libraries/H5P.JoubelUI-1.3/css/joubel-help-dialog.css?ver=1.3.19 net::ERR_NAME_NOT_RESOLVED
(anonymous)	@	jquery.js?ver=1.16.1:2
Pe	@	jquery.js?ver=1.16.1:2
append	@	jquery.js?ver=1.16.1:2
(anonymous)	@	h5peditor.js?ver=1.16.1:121
ns.libraryRequested	@	h5peditor.js?ver=1.16.1:117
success	@	h5peditor.js?ver=1.16.1:238
c	@	jquery.js?ver=1.16.1:2
fireWith	@	jquery.js?ver=1.16.1:2
l	@	jquery.js?ver=1.16.1:2
(anonymous)	@	jquery.js?ver=1.16.1:2
XMLHttpRequest.send		
send	@	jquery.js?ver=1.16.1:2
ajax	@	jquery.js?ver=1.16.1:2
ns.loadLibrary	@	h5peditor.js?ver=1.16.1:218
ns.LibrarySelector.loadSemantics	@	h5peditor-library-se…r.js?ver=1.16.1:250
librarySelectHandler	@	h5peditor-library-se…or.js?ver=1.16.1:68
ns.SelectorHub.getSelectedLibrary	@	h5peditor-selector-hub.js?ver=1.16.1:226
loadLibrary	@	h5peditor-library-se…or.js?ver=1.16.1:80
call	@	h5p-event-dispatcher.js?ver=1.16.1:209
EventDispatcher.trigger	@	h5p-event-dispatcher.js?ver=1.16.1:240
(anonymous)	@	h5peditor-selector-hub.js?ver=1.16.1:59
(anonymous)	@	h5p-hub-client.js?ver=1.16.1:45
trigger	@	h5p-hub-client.js?ver=1.16.1:45
n.handleUse	@	h5p-hub-client.js?ver=1.16.1:33
n.handleDetailUse	@	h5p-hub-client.js?ver=1.16.1:40
n.handleUse	@	h5p-hub-client.js?ver=1.16.1:40
u	@	h5p-hub-client.js?ver=1.16.1:25
invokeGuardedCallback	@	h5p-hub-client.js?ver=1.16.1:33
invokeGuardedCallbackAndCatchFirstError	@	h5p-hub-client.js?ver=1.16.1:33
h	@	h5p-hub-client.js?ver=1.16.1:25
b	@	h5p-hub-client.js?ver=1.16.1:25
g	@	h5p-hub-client.js?ver=1.16.1:25
m	@	h5p-hub-client.js?ver=1.16.1:25
T	@	h5p-hub-client.js?ver=1.16.1:25
qr	@	h5p-hub-client.js?ver=1.16.1:33
ke	@	h5p-hub-client.js?ver=1.16.1:25
batchedUpdates	@	h5p-hub-client.js?ver=1.16.1:25
J	@	h5p-hub-client.js?ver=1.16.1:25
Me	@	h5p-hub-client.js?ver=1.16.1:25
jquery.js?ver=1.16.1:2 
 
 GET https://wp-content/uploads/h5p/libraries/H5P.JoubelUI-1.3/css/joubel-slider.css?ver=1.3.19 net::ERR_NAME_NOT_RESOLVED
(anonymous)	@	jquery.js?ver=1.16.1:2
Pe	@	jquery.js?ver=1.16.1:2
append	@	jquery.js?ver=1.16.1:2
(anonymous)	@	h5peditor.js?ver=1.16.1:121
ns.libraryRequested	@	h5peditor.js?ver=1.16.1:117
success	@	h5peditor.js?ver=1.16.1:238
c	@	jquery.js?ver=1.16.1:2
fireWith	@	jquery.js?ver=1.16.1:2
l	@	jquery.js?ver=1.16.1:2
(anonymous)	@	jquery.js?ver=1.16.1:2
XMLHttpRequest.send		
send	@	jquery.js?ver=1.16.1:2
ajax	@	jquery.js?ver=1.16.1:2
ns.loadLibrary	@	h5peditor.js?ver=1.16.1:218
ns.LibrarySelector.loadSemantics	@	h5peditor-library-se…r.js?ver=1.16.1:250
librarySelectHandler	@	h5peditor-library-se…or.js?ver=1.16.1:68
ns.SelectorHub.getSelectedLibrary	@	h5peditor-selector-hub.js?ver=1.16.1:226
loadLibrary	@	h5peditor-library-se…or.js?ver=1.16.1:80
call	@	h5p-event-dispatcher.js?ver=1.16.1:209
EventDispatcher.trigger	@	h5p-event-dispatcher.js?ver=1.16.1:240
(anonymous)	@	h5peditor-selector-hub.js?ver=1.16.1:59
(anonymous)	@	h5p-hub-client.js?ver=1.16.1:45
trigger	@	h5p-hub-client.js?ver=1.16.1:45
n.handleUse	@	h5p-hub-client.js?ver=1.16.1:33
n.handleDetailUse	@	h5p-hub-client.js?ver=1.16.1:40
n.handleUse	@	h5p-hub-client.js?ver=1.16.1:40
u	@	h5p-hub-client.js?ver=1.16.1:25
invokeGuardedCallback	@	h5p-hub-client.js?ver=1.16.1:33
invokeGuardedCallbackAndCatchFirstError	@	h5p-hub-client.js?ver=1.16.1:33
h	@	h5p-hub-client.js?ver=1.16.1:25
b	@	h5p-hub-client.js?ver=1.16.1:25
g	@	h5p-hub-client.js?ver=1.16.1:25
m	@	h5p-hub-client.js?ver=1.16.1:25
T	@	h5p-hub-client.js?ver=1.16.1:25
qr	@	h5p-hub-client.js?ver=1.16.1:33
ke	@	h5p-hub-client.js?ver=1.16.1:25
batchedUpdates	@	h5p-hub-client.js?ver=1.16.1:25
J	@	h5p-hub-client.js?ver=1.16.1:25
Me	@	h5p-hub-client.js?ver=1.16.1:25
jquery.js?ver=1.16.1:2 
 
 GET https://wp-content/uploads/h5p/libraries/FontAwesome-4.5/h5p-font-awesome.min.css?ver=4.5.4 net::ERR_NAME_NOT_RESOLVED