Index out of range: Parameter name: index?

[Derp]

I was trying to import OBJ and Dae files from blender when this occured.
Log:
************** Exception Text **************
System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
at System.ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument argument, ExceptionResource resource)
at Bfres.Structs.FSHP.UpdateVertices() in C:\projects\switch-toolbox-fkj3m\File_Format_Library\FileFormats\BFRES\Bfres Structs\SubFiles\FMDL\FSHP.cs:line 1892
at FirstPlugin.BfresWiiU.SaveVertexBuffer(FSHP fshp) in C:\projects\switch-toolbox-fkj3m\File_Format_Library\FileFormats\BFRES\BfresWiiU.cs:line 1004
at Bfres.Structs.FSHP.SaveVertexBuffer(Boolean IsWiiU) in C:\projects\switch-toolbox-fkj3m\File_Format_Library\FileFormats\BFRES\Bfres Structs\SubFiles\FMDL\FSHP.cs:line 1521
at Bfres.Structs.FMDL.AddOjects(String FileName, ResFile resFileNX, ResFile resFileU, Boolean Replace) in C:\projects\switch-toolbox-fkj3m\File_Format_Library\FileFormats\BFRES\Bfres Structs\SubFiles\FMDL.cs:line 1345
at Bfres.Structs.FMDL.Replace(String FileName, ResFile resFileNX, ResFile resFileU) in C:\projects\switch-toolbox-fkj3m\File_Format_Library\FileFormats\BFRES\Bfres Structs\SubFiles\FMDL.cs:line 612
at Bfres.Structs.BFRESGroupNode.Import(String[] FileNames, ResFile resFileNX, ResFile resFileU) in C:\projects\switch-toolbox-fkj3m\File_Format_Library\FileFormats\BFRES\BFRESGroupNode.cs:line 461
at Toolbox.Library.NodeWrappers.STGenericWrapper.ImportAction(Object sender, EventArgs e)
at System.Windows.Forms.ToolStripItem.RaiseEvent(Object key, EventArgs e)
at System.Windows.Forms.ToolStripMenuItem.OnClick(EventArgs e)
at System.Windows.Forms.ToolStripItem.HandleClick(EventArgs e)
at System.Windows.Forms.ToolStripItem.HandleMouseUp(MouseEventArgs e)
at System.Windows.Forms.ToolStrip.OnMouseUp(MouseEventArgs mea)
at System.Windows.Forms.ToolStripDropDown.OnMouseUp(MouseEventArgs mea)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ToolStrip.WndProc(Message& m)
at System.Windows.Forms.ToolStripDropDown.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

************** Loaded Assemblies **************
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************** JIT Debugging **************
To enable just-in-time (JIT) debugging, the .config file for this
application or computer (machine.config) must have the
jitDebugging value set in the system.windows.forms section.
The application must also be compiled with debugging
enabled.

For example:

When JIT debugging is enabled, any unhandled exception
will be sent to the JIT debugger registered on the computer
rather than be handled by this dialog box.