Why my huawei y9s sim tray is not opening

Why my huawei y9s sim tray is not opening

I have just changed my huawei y9s screen with a frame. After assembling it, my sim tray doesn’t open any more. What did i do wrong? It doesn’t have any thing in there, when i put the needle inside the sim try, it doesn’t have anything there. It is just going all the