Object reference not set to an instance of an object.

[osccoding]

I have the following error:

System.NullReferenceException: Object reference not set to an instance of an object.
   at AELwuEV9suArmhdjLB0.w6l0FPV3Xx9CIR5fxqm.MLPqRINXbo(Object  , EventArgs  )
   at System.Windows.Forms.CheckBox.OnCheckedChanged(EventArgs e)
   at System.Windows.Forms.CheckBox.set_CheckState(CheckState value)
   at System.Windows.Forms.CheckBox.OnClick(EventArgs e)
   at System.Windows.Forms.CheckBox.OnMouseUp(MouseEventArgs mevent)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ButtonBase.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, WM msg, IntPtr wparam, IntPtr lparam)

App Version: 2.5.3.0 Project targets: 0 DLC name: v Collection name: ** // ** Project path: D:\OSC FICHIERS\elevateRP\resources[Cores]\elevate_clothes\clothproject_Elevate\clothproject_Elevate Output path: D:\OSC FICHIERS\elevateRP\resources[Cores]\elevate_clothes\clothproject_Elevate Disable Extra Ymt Creation: False Create Subfolder For Cloth Drawable Types: False Replace settings enabled: False // DLC: NoDlc Save File Version: 0

Cloth files:
`[Please provide cloth files (ydd, ytd), cloth project and any other related files here + describe reproduction steps]`