I've made MANY customs before, but this is the first time the toolkit has come up with this error. In short, it reads:

"Wwise audio file conversion failed: access to path '...\Rocksmith Toolkit\Template\Originals\SFX\PlaceHolder.txt' is denied."

 

I've never had this happen to me and it just started doing this out of nowhere. Any ideas?

 

 

Did you ever find the answer since it is happening to me too and I don't know what to do.

Use DLC Builder instead. RS Toolkit is no longer supported.

https://github.com/iminashi/Rocksmith2014.NET/releases