Given the reference to "your administrator" the user-facing sorry seems fine. IMNSHO, dev-facing error messages bifurcate: - errors for unsuitable input should not be apologetic: "inconsistent def'ns at foo:42 and bar:69" - errors for implementation limitations may be apologetic: "sorry, at foo:42 node bar has 69 attributes; this implementation supports at most 63"
I'm administrator! :'-(