Happened to me too.
I was browsing my classes at the class counter, suddenly a message of "Purchase has been withheld due to an error. [No. 953]" appeared near the bottom of the screen for about a second and disappeared. It was too fast that I couldn't take a screenshot, but I could capture a video clip. Will upload the clip if there was a request from the GMs.
My recent purchases were, 30 days premium on 18th, material storage 30 days on yesterday, fresh find items Autumn Leaf Hairpin: Blue and Autumn Leaf Studs: Gold several hours ago, if I remember right.