Tttrial and Eror is a mini-LP by German electronic musician Apparat. It was released on 18 February 2002 on Shitkatapult label. Tttrial and Eror was recorded at Tracnet Studio, Berlin in 2001. In 2015, the mini-album was included in the reissue compilation of Sascha Ring's first three records, titled Multifunktionsebene, Tttrial and Eror, Duplex.
Tttrial and Erors music style has been characterized as dark, glitch-driven electronic music with complex broken rhythms, warped synthlines, melodic backdrops, and noisy, malfunction-inspired elements. Paul Simpson of AllMusic called it an "abrasive yet melodic" IDM release, characteristic of Ring's early work. The mini-album has been described as stylistically similar to Autechre, Phonem and Aphex Twin.
Credits adapted from the liner notes of Tttrial and Eror.