Here’s the error: the triangles are not congruent by the ASA Congruence Theorem. The ASA Theorem would mean that two corresponding congruent pairs of angles would be adjacent to a pair of corresponding congruent sides. However, this is not the case. Rather, there are two pairs of corresponding congruent angles and a pair of corresponding congruent sides, where only one pair of angles is adjacent to the pair of sides. Therefore, the AAS Theorem must be used instead to prove both triangles congruent.