An unhandled exception of type 'Microsoft.DirectX.Direct3D.Direct3DXException' occurred in Microsoft.DirectX.Direct3DX.dll

"An unhandled exception of type 'Microsoft.DirectX.Direct3D.Direct3DXException' occurred in Microsoft.DirectX.Direct3DX.dll" with additional information "error application"

public void drawMesh(Object3D objct, Matrix mat)
        {
            
            object1.scale=new Vector3(scalex,scaley,scalez);
            
            object1.translation= new Vector3(transx, transy, transz);
            SetupLights(100, -50, -100);

            _device.RenderState.CullMode = Cull.Clockwise;
            
            
                if (objct.extddMatrls != null)
                {
                    _device.Transform.World = Matrix.RotationZ(rotz) * Matrix.RotationY(roty) * Matrix.RotationX(rotx) * Matrix.Scaling(object1.scale) * Matrix.Translation(object1.translation) * mat;
                    for (int count = 0; count < objct.extddMatrls.Length; count++)
                    {
                        _device.Material = objct.matrls[count];
                        _device.SetTexture(0, objct.textre[count]);

                        objct.mesh.DrawSubset(count);// here i got the error
                        
                    }
                }