From the Hans Christian Andersen biography "The Life of Hans Christian Andersen. Day By Day", written by DPhil Johan de Mylius:
Release of Henrik Hertz's Gjengangerbreve (Letters of a Ghost), published anonymously, including amongst other items an attempt to ridicule HCA. The book receives a great deal of attention in literary circles. It is seen as a work which embraces Heiberg's demand that poetic form be given greater consideration. 2nd edition of the book is released in 1831.
The book becomes an initial thorn in the relationship between HCA and the Heiberg set. Later, an actual conflict develops. Hertz and HCA are not reconciled until they meet in Rome after November 1833.