Hmm... that's unusual. I've been using the latest versions of all shinybobs for all my testing, and never had a problem with it. There might be some unique mod settings or mod load order that lead to this error.
That error is especially baffling, considering ShinyIcons mod folder doesn't have any graphics whatsoever. There is one of those in ShinyBobGFX, but why would ShinyIcons be throwing the error, and be pointing to its own location...
I can't seem to be able to recreate this error, and I don't really know where this error is occuring because I don't know where the icon is being used.