Failed to call hook 'LoadImageList' on plugin 'ImageLibrary v2.0.46' (NullReferenceException: Object reference not set to an instance of an object)
at Oxide.Plugins.ImageLibrary.HasImage (System.String imageName, System.UInt64 imageId) [0x00000] in <71cdc7c162514b62a94158ea0dcaa377>:0

at Oxide.Plugins.ImageLibrary.LoadImageList (System.String title, System.Collections.Generic.List`1[T] imageList, System.Action callback) [0x00029] in <71cdc7c162514b62a94158ea0dcaa377>:0

at Oxide.Plugins.ImageLibrary.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x000bf] in <71cdc7c162514b62a94158ea0dcaa377>:0

.....etc
This only seems to be affecting the SkipNightUI plugin, which no longer works.

As noted by another user on a different, recent thread, I also tried changing the download url's to omit the 'www' portion of the address but that had no affect.

Failed to call hook 'LoadImageList' on plugin 'ImageLibrary v2.0.46' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.ImageLibrary.HasImage (System.String imageName, System.UInt64 imageId) [0x00000] in <d9af518b23914dea94506faa6f5ad6aa>:0
  at Oxide.Plugins.ImageLibrary.LoadImageList (System.String title, System.Collections.Generic.List`1[T] imageList, System.Action callback) [0x00029] in <d9af518b23914dea94506faa6f5ad6aa>:0
  at Oxide.Plugins.ImageLibrary.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x000bf] in <d9af518b23914dea94506faa6f5ad6aa>:0
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <9affce1cd15c4ec183941adef8db1722>:0
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <4452f821def6406d834e4149849fe7ea>:0
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <4452f821def6406d834e4149849fe7ea>:0

Failed to call hook 'HasImage' on plugin 'ImageLibrary v2.0.60' (NullReferenceException: Object reference not set to an instance of an object) at Oxide.Plugins.ImageLibrary.IsInStorage (System.UInt32 crc) [0x00000] in <51bd8c85c1254c958f65450ae0a987c7>:0 at Oxide.Plugins.ImageLibrary.HasImage (System.String imageName, System.UInt64 imageId) [0x00031] in <51bd8c85c1254c958f65450ae0a987c7>:0 at Oxide.Plugins.ImageLibrary.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x00818] in <51bd8c85c1254c958f65450ae0a987c7>:0 at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in :0 at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <99d545163fdd4d57a562df7989f2ca0a>:0 at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <99d545163fdd4d57a562df7989f2ca0a>:0