{
  "AutoEvent (enables auto event spawns)": true,
  "AutoEventDuration (time until new event spawns)": 1800.0
}

{
    "Events": [
    {
      "EventDuration (duration the event will be active for)": 1800.0,
      "AutoHack (enables auto hacking of crates when an event is finished)": true,
      "AutoHackSeconds (countdown for crate to unlock in seconds)": 60.0,
      "UseKits (use custom kits plugin)": false,
      "KitName (custom kit name)": null,
      "NpcName (custom name)": "Hard Guard",
      "NpcCount (number of guards to spawn)": 10,
      "NpcHealth (health guards spawn with)": 200.0,
      "NpcRadius (max distance guards will roam)": 50.0,
      "NpcAggression (max aggression distance guards will target)": 150.0,
      "MarkerColor (marker color)": "#e81728",
      "MarkerBorderColor (marker border color)": "#000000",
      "MarkerOpacity (marker opacity)": 1.0,
      "UseLoot (use custom loot table)": false,
      "MaxLootItems (max items to spawn in crate)": 6,
      "CustomLoot (items to spawn in crate)": [
        {
          "Shortname": "rifle.ak",
          "MinAmount": 1,
          "MaxAmount": 1
        },
        {
          "Shortname": "ammo.rocket.basic",
          "MinAmount": 3,
          "MaxAmount": 3
        },
        {
          "Shortname": "rifle.lr300",
          "MinAmount": 1,
          "MaxAmount": 1
        },
        {
          "Shortname": "explosive.timed",
          "MinAmount": 3,
          "MaxAmount": 4
        },
        {
          "Shortname": "autoturret",
          "MinAmount": 1,
          "MaxAmount": 2
        },
        {
          "Shortname": "stones",
          "MinAmount": 3000,
          "MaxAmount": 5000
        },
        {
          "Shortname": "sulfur.ore",
          "MinAmount": 3000,
          "MaxAmount": 5000
        }
      ]
    }
  ]
}

Gives error:

GuardedCrate v1.3.8: Failed to load config file (is the config file corrupt?) (Additional text encountered after finished reading JSON content: {. Path '', line 5, position 0.)​

Managed to make it work by deleting the autoevent config.

However does not work the npc and loot configs. My current config is at:

{
    "Events": [
    {
      "EventDuration (duration the event will be active for)": 1800.0,
      "AutoHack (enables auto hacking of crates when an event is finished)": true,
      "AutoHackSeconds (countdown for crate to unlock in seconds)": 300.0,
      "UseKits (use custom kits plugin)": false,
      "KitName (custom kit name)": null,
      "NpcName (custom name)": "Cover Team",
      "NpcCount (number of guards to spawn)": 25,
      "NpcHealth (health guards spawn with)": 300.0,
      "NpcRadius (max distance guards will roam)": 50.0,
      "NpcAggression (max aggression distance guards will target)": 250.0,
      "MarkerColor (marker color)": "#e81728",
      "MarkerBorderColor (marker border color)": "#000000",
      "MarkerOpacity (marker opacity)": 1.0,
      "UseLoot (use custom loot table)": true,
      "MaxLootItems (max items to spawn in crate)": 5,
      "CustomLoot (items to spawn in crate)": [
        {
          "Shortname": "rifle.ak",
          "MinAmount": 1,
          "MaxAmount": 1
        },
        {
          "Shortname": "ammo.rocket.basic",
          "MinAmount": 1,
          "MaxAmount": 3
        },
        {
          "Shortname": "rifle.lr300",
          "MinAmount": 1,
          "MaxAmount": 1
        },
        {
          "Shortname": "explosive.timed",
          "MinAmount": 1,
          "MaxAmount": 4
        },
        {
          "Shortname": "autoturret",
          "MinAmount": 1,
          "MaxAmount": 3
        },
        {
          "Shortname": "gunpowder",
          "MinAmount": 1000,
          "MaxAmount": 2500
        },
        {
          "Shortname": "sulfur.ore",
          "MinAmount": 2000,
          "MaxAmount": 6000
        },
		{
          "Shortname": "explosives",
          "MinAmount": 5,
          "MaxAmount": 70
        },
		{
          "Shortname": "explosive.satchel",
          "MinAmount": 2,
          "MaxAmount": 10
        },
		{
          "Shortname": "ammo.rifle.explosive",
          "MinAmount": 30,
          "MaxAmount": 120
        }
      ]
    }
  ]
}

Looks like you copied the content from the plugin page, which is not all for the configuration.

This is the CONFIG file

{
  "AutoEvent (enables auto event spawns)": true,
  "AutoEventDuration (time until new event spawns)": 3600.0
}
​

and this the configurable DATA file (with changes i have made)

{
  "Events": [
    {
      "EventDuration (duration the event will be active for)": 450.0,
      "AutoHack (enables auto hacking of crates when an event is finished)": true,
      "AutoHackSeconds (countdown for crate to unlock in seconds)": 120.0,
      "UseKits (use custom kits plugin)": true,
      "KitName (custom kit name)": "crate",
      "NpcName (custom name)": "Special Crate Guard",
      "NpcCount (number of guards to spawn)": 2,
      "NpcHealth (health guards spawn with)": 200.0,
      "NpcRadius (max distance guards will roam)": 25.0,
      "NpcAggression (max aggression distance guards will target)": 150.0,
      "MarkerColor (marker color)": "#32a844",
      "MarkerBorderColor (marker border color)": "#000000",
      "MarkerOpacity (marker opacity)": 0.9,
      "UseLoot (use custom loot table)": false,
      "MaxLootItems (max items to spawn in crate)": 6,
      "CustomLoot (items to spawn in crate)": []
    },
    {
       "EventDuration (duration the event will be active for)": 500.0,
      "AutoHack (enables auto hacking of crates when an event is finished)": true,
      "AutoHackSeconds (countdown for crate to unlock in seconds)": 180.0,
      "UseKits (use custom kits plugin)": true,
      "KitName (custom kit name)": "cratespecial",
      "NpcName (custom name)": "Hard Crate Guard",
      "NpcCount (number of guards to spawn)": 3,
      "NpcHealth (health guards spawn with)": 250.0,
      "NpcRadius (max distance guards will roam)": 35.0,
      "NpcAggression (max aggression distance guards will target)": 170.0,
      "MarkerColor (marker color)": "#32a844",
      "MarkerBorderColor (marker border color)": "#000000",
      "MarkerOpacity (marker opacity)": 0.9,
      "UseLoot (use custom loot table)": false,
      "MaxLootItems (max items to spawn in crate)": 8,
      "CustomLoot (items to spawn in crate)": []
    },
    {
       "EventDuration (duration the event will be active for)": 550.0,
      "AutoHack (enables auto hacking of crates when an event is finished)": true,
      "AutoHackSeconds (countdown for crate to unlock in seconds)": 300.0,
      "UseKits (use custom kits plugin)": true,
      "KitName (custom kit name)": "crateveryhard",
      "NpcName (custom name)": "Very Hard Crate Guard",
      "NpcCount (number of guards to spawn)": 4,
      "NpcHealth (health guards spawn with)": 300.0,
      "NpcRadius (max distance guards will roam)": 50.0,
      "NpcAggression (max aggression distance guards will target)": 200.0,
      "MarkerColor (marker color)": "#32a844",
      "MarkerBorderColor (marker border color)": "#000000",
      "MarkerOpacity (marker opacity)": 0.9,
      "UseLoot (use custom loot table)": false,
      "MaxLootItems (max items to spawn in crate)": 10,
      "CustomLoot (items to spawn in crate)": []
    }
  ]
}
​