having problems to get it to work

This happens when I try to start the event I need some help with this I didn't start automatically so I tried to  start it /convoystart - launches the event using a random preset based on your configuration

Failed to call hook 'ChatStartCommand' on plugin 'Convoy v2.7.9' (NullReferenceException: Object reference not set to an in stance of an object)
at Oxide.Plugins.Convoy+EventLauncher.DefineEventConfig (System.String eventPresetName) [0x00040] in <3fe7403129a347d7ac3c75a233cf51df>:0
at Oxide.Plugins.Convoy+EventLauncher.DelayStartEvent (System.Boolean isAutoActivated, BasePlayer activator, System.String presetName) [0x00035] in <3fe7403129a347d7ac3c75a233cf51df>:0
at Oxide.Plugins.Convoy.ChatStartCommand (BasePlayer player, System.String command, System.String[] arg) [0x00010] in <3fe7403129a347d7ac3c75a233cf51df>:0
at Oxide.Plugins.Convoy.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x02cd2] in <3fe7403129a347d7ac3c75a233cf51df>:0
at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <42f9bedc659b4f4786eb778d3cd58968>:0
at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000de] in <d59b507fd76240e5b62228d0eae39b73>:0
at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <d59b507fd76240e5b62228d0eae39b73>:0

Hello

Send your config

I saw something on support where somebody to deleted the config then reload it again so I did that. But I haven't seen it working do you have to have so many players on the server before it actually works .okay sending you my config  can I pick what mode I want only if I only want easy

Convoy.json

The config looks fine. Text a command here as you try to launch it.

Thank you I got it working is there anywhere I can just set it to medium in the config

"The minimum time after the server's wipe when this preset can be selected automatically [sec]": 0,
      "The maximum time after the server's wipe when this preset can be selected automatically [sec] (-1 - do not use this parameter)": -1,

Pay attention to these two settings in the config.
Set them like this for each preset, and then the presets will spawn randomly.

I'm sorry but you just lost me with all that stuff that you said

Convoy.json
I've edited your config for you.