Limma-voom can't find object

Hey guys,

First time posting here. I’m running an RNA-seq analysis but I am stuck at the Limma-voom step.

Here’s the error I am getting:
Error in eval(ej, envir = levelsenv) : object ‘Control_Old’ not found
Calls: makeContrasts -> eval -> eval
Execution halted

I just genuinely can’t understand how it isn’t found. I double checked the spelling and everything.