How to repair militay supressor?

[Survivor Of Many]

So i was at heritage, was shooting zombies with my silenced avenger and then my supressor broke! went to repair it and I have everything, blowtorch, 4 scrap, and of course the suppressor. Even have lvl 3 repair and it still wont let me repair it. am i missing something?

[Super Twinkie Chud Qners]

Did you take the suppresser off? Are you in the right tab?

[Engineer TF2]

Upgrade the "maintain more advanced blueprints" skill, i dont remember the name but its required to repair supressors and guns, also make your its in your inventory

[Survivor Of Many]

Yeah ive done both the things you guys have said. must be a glitch or ive been thinking maybe i need to be by a fire. Although it would say that right?