SQLHandler connection don't working

Hello guys,
I’ve faced some problems with my script. It was working perfectly, but today for some reason it doesn’t working anymore, it gives me an error what I’ve not seen and don’t get it what it needs for solution. Here is what error I get :
I think problem is with my SQLHandler, but why it is not working anymore when it was working ?

also here is my code :

SQLHandler :

Also this error appears :