(10:54:38) | Failed to call hook 'dropRandom' on plugin 'FancyDrop v2.9.2' (InvalidCastException: Specified cast is not valid.)
at Oxide.Plugins.FancyDrop.startCargoPlane (UnityEngine.Vector3 dropToPos, System.Boolean randomDrop, CargoPlane plane, System.String dropType, System.String staticList, System.Boolean showinfo, System.UInt64 userID) [0x002fd] in <1627a5e911eb422f8701fdc725225e59>:0
at Oxide.Plugins.FancyDrop.dropRandom (ConsoleSystem+Arg arg) [0x00110] in <1627a5e911eb422f8701fdc725225e59>:0
at Oxide.Plugins.FancyDrop.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x00e8c] in <1627a5e911eb422f8701fdc725225e59>:0
at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <80b90e8213db44b29ec2d4111764172c>:0
at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <ec05e0208c9149bba43236ca58fea105>:0
at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <ec05e0208c9149bba43236ca58fea105>:0
(10:54:38) | [FancyDrop] Timed Airdrop initiated with command 'ad.random'
(10:54:38) | [FancyDrop] Next timed Airdrop in 42 minutes

Looks like you may have an error in your configuration with one of the settings.

Valid JSON

The json being valid doesn't mean it is a valid configuration. The error means that one of the values is set to something that the plugin is not expecting; likely a number.

ok I will look at it again.

Merged post

Apparently this fellow must have made the same, identical mistake I did only his was a year ago:    https://umod.org/community/fancy-drop/8925-invalidcastexception-at-startcargoplane?page=1#post-1

Merged post

And the author doesn't accept private messages.   Looks like another plugin I'll have to learn to live without :(