Final answer:
Chris's error in copying 2T in a mathematical transformation task may stem from improper application of transformations or incorrect sequencing. Without more context, it's difficult to identify the specific mistake.
Step-by-step explanation:
The question seems to be related to a mathematical concept, most likely involving transformations such as reflections, rotations, translations, or dilations. Since it is mentioned that Chris is attempting to copy 2T, which could mean 'copy an object transformed twice', the error could be rooted in not performing the correct transformations or not applying them in the correct sequence. Unfortunately, without more context or a specific description of what Chris did, it's challenging to provide a precise explanation of the error. To correct such mistakes, one should ensure that each transformation is applied accurately according to its definition, and in the same order as it was intended when the original object underwent 2T.