Root level exception in OnGUI(): System.ArgumentNullException: Argument cannot be null.
Parameter name: type
at System.Activator.CheckType (System.Type type) [0x00000] in <filename unknown>:0
at System.Activator.CreateInstance (System.Type type, Boolean nonPublic) [0x00000] in <filename unknown>:0
at System.Activator.CreateInstance (System.Type type) [0x00000] in <filename unknown>:0
at Verse.ThingMaker.MakeThing (Verse.ThingDef def, Verse.ThingDef stuff) [0x00000] in <filename unknown>:0
at Verse.DebugThingPlaceHelper.DebugSpawn (Verse.ThingDef def, IntVec3 c, Int32 stackCount, Boolean direct) [0x00000] in <filename unknown>:0
at Verse.DebugThingPlaceHelper+<TryPlaceOptionsForStackCount>c__AnonStorey2.<>m__0 () [0x00000] in <filename unknown>:0
at Verse.DebugTool.DebugToolOnGUI () [0x00000] in <filename unknown>:0
at Verse.DebugTools.DebugToolsOnGUI () [0x00000] in <filename unknown>:0
at RimWorld.UIRoot_Play.UIRootOnGUI () [0x00000] in <filename unknown>:0
at Verse.Root.OnGUI () [0x00000] in <filename unknown>:0
Verse.Log:Error(String, Boolean)
Verse.Root:OnGUI()

Similar problem to another user. Blueprint is placed but item fails to build, resources are wasted and that pops up in the log

I'll need a full log for this.

{LINK REMOVED}https://git.io/fhfjZ

Thank you a lot, I have updated this mod, please keep me updated.

{LINK REMOVED}https://git.io/fhJCE

I am still getting the error, is there anything you would like me to check on my client?

I resubscribed and it's now fixed, thank you!

I'm glad it worked and it's fixed, thanks to you for your report.