Accuracy is an important characteristic of any technical translation. Accuracy refers to preserving the meaning of the original text. The term accurate is essentially synonymous with the term faithfulness, but some translation theoreticians differentiate between the two terms. A translation which is accurate is faithful to the intended meaning of the  original author. Notice that, a translation can be coherent and cohesive but inaccurate. The error creating difference in the meaning, adding or omitting something, difference in headers and footers etc. can be termed as the error of accuracy.