how do i fix this error? (attempt to concatenate Instance with string)

Hello, this is my second question. I'd like to know why this code doesn't work. So what i'm trying to make is a edit of a animation to main module converter. I'm trying to make it lerp so i don't have to make it do it manually when i run it in the execution bar i get the error attempt to concatenate Instance with string, I'm a decent scripter as well. i made a among us script that got leaked over 100 times due to no protection (rip my privacy :( ) Also here's the code that keeps on erroring

                        for i,v in pairs(sequence.Parent.Parent:GetDescendants()) do
                            if v.ClassName == 'Motor6D' then
                                if v.Part1 == sequence.Parent.Parent:FindFirstChild(start.Name) or v.Part0 == sequence.Parent.Parent:FindFirstChild(start.Name) then
                                    hhhjjjjjihfjjm = v
                                end
                            end
                        end

                        AddLine("clerp("..sequence.Parent.Parent:FindFirstChild(hhhjjjjjihfjjm.Parent.Name):FindFirstChild(hhhjjjjjihfjjm.Name)..","..ConvertCFrame(start.CFrame, true)..",".."0.25,".."false,".."0.25"..")",1)

The addline part for some reason keeps on erroring. I don't know how to fix it either.

It has something to do with the motor6d part. I've tried everything i thought would work. Help would be appreciated.