Was making changes in the config, reloaded, and got this. Checked file using jsonlint and it's valid. Any ideas what I've done?

Unloaded plugin BetterLoot v3.0.1 by Default
[BetterLoot] Using '20' active of '20' supported containertypes
[BetterLoot] Updating internals ...
Loaded plugin BetterLoot v3.0.1 by Default
[BetterLoot] No stacked LootContainer found.
Exception while calling NextTick callback (NullReferenceException: Object reference not set to an instance of an object)
at Oxide.Plugins.BetterLoot.PopulateContainer (LootContainer container) [0x002da] in <9fd850722f1f4bf7acbc91121ab90d76>:0
at Oxide.Plugins.BetterLoot.<UpdateInternals>m__0 () [0x000b2] in <9fd850722f1f4bf7acbc91121ab90d76>:0
at Oxide.Core.OxideMod.OnFrame (System.Single delta) [0x00051] in <ac41dd3599754d448b8c218b34645820>:0

oxide.reload BetterLoot
BetterLoot was compiled successfully in 1721ms
Unloaded plugin BetterLoot v3.0.1 by Default
[BetterLoot] Using '20' active of '20' supported containertypes
[BetterLoot] Updating internals ...
Loaded plugin BetterLoot v3.0.1 by Default
[BetterLoot] Removed 14 stacked LootContainer
Exception while calling NextTick callback (NullReferenceException: Object reference not set to an instance of an object)
at Oxide.Plugins.BetterLoot.PopulateContainer (LootContainer container) [0x002da] in <28d0ffee2d284ab1bec9b9c52c72f810>:0
at Oxide.Plugins.BetterLoot.<UpdateInternals>m__0 () [0x000b2] in <28d0ffee2d284ab1bec9b9c52c72f810>:0
at Oxide.Core.OxideMod.OnFrame (System.Single delta) [0x00051] in <ac41dd3599754d448b8c218b34645820>:0

Was my config, deleted it, and the plugin compiled fine.