error in step 4

[LeslieSHIFT]

Hello everyone, I encountered an error while running Step 4. The error message is as follows;

Unable to perform assignment because the indices on the left side are not compatible with the size of the
right side.

Error in STEP_4_Angle_Finder (line 90)
max_APpos_stage1(img_no_ii)=AP_rough_best;

what could be the reason? If I use the images provided by the authors, there are no errors, and I have already corrected the relevant parameters in Step 0.