What err may mean? Google images

An assumption is that an ideal law grows out of morals, and corresponds to the principle of legitimate expectation.  Therefore, it is specifically sad to already see that a Corrigenda on four pages has been adopted to the Treaty of Lisbon OJ C 290 of 30 Nov. 2009, that, for example, renames „External action by the Union” as „The Union’s external action“, etc. You may take a look at http://eur-lex.europa.eu/en/treaties/index.htm