Can't assemble Robby in Story

[Gladion773]

I'm at the story mission where I can repair Robby. I did everything as usual, disassembling it, throwing away the broken parts and buying new ones, everything was going well. Then, when it came to re-assembling Robby, I can't put the Front Body Panel on. I have no idea why, every other step before it ive done, even adding the legs, and made sure all screws are in, yet I can't put the Front Body Panel on, I even bought a new one but it didn't work either.