I think the doc below explains this very well.
Let's call two files
D:\10.Task\2024\1.HEV 해석\JX1 T4대응\해석 재료\통합스크립트\HEV_TMED_Simulator_V12.slx
as file A and
D:\10.Task\2024\1.HEV 해석\PHEV 대비 xEV 연비 비교 검토\해석 재료\통합스크립트\HEV_TMED_Simulator_V12.slx
as file B.
So the problem is that MATLAB can't find file A. However, file B exists with the same file name and its path is added as one of MATLAB Path.