LNK2001 & LNK2019 | MASS Translator causes linking issues when trying to derived from it

I have been trying to derived from UMassProcessors & Translators lately on Unreal Engine 5.6.1.

Which I understand has a slew of issues in regard to Gauntlet.Automation & other linkihng errors.

But using the same version of the engine, but a new project has stopped me from being able to use MASS framework like I used to.

Here is the .h header file.

And here’s the .CPP

It has the include of the header which I haven’t shown in this.

But despite following the MassTranlators ready to use in Unreal, I get linking errors.

image

What could be the issue? I had this exact setup working before & even start this on a fresh project on the same version of the engine, UE5.6.1