LNK 2005 Error: Already defined in cpp.obj

I’ve tried cleaning the project multiple times. Each function is only defined once in the CPP file.

Sometimes when I build it from the editor, it says build succeeded, but nothing changes. I’ll restart the editor, and the new functions will not show up.

I’m not actually sure what to do right now.

Considering those are replication related function those functions been probably generated by UHT and you should use only ServerCheckForCooldown_Implementation

That was it. Thank you very much. I was going insane.

Sorry to resurrect an old thread, but I just wanted to thank you personally @Shadowriver for all the contributions you’ve made to this community. This answer saved me from going crazy. Found myself quadruple-checking all of my CPP files, scratching my head the whole time when only one definition was found. Ordinarily, it’s such a simple and common linker error… but very deceitful when working with UE4 & RPCs.