I was running this code and got the following error.

Traceback $($most recent call last$)$:

File $"/$home$/$runner$/$local$/$submission$/$main$.$py$",$ line $149,$ in

if test$\_$case.execute$($test$\_$feedback$)$:

File $"/$home$/$runner$/$local$/$submission$/$LCSTestCase$.$py$",$ line $33,$ in execute

actual $=$ user$\_$matrix.get$\_$longest$\_$common$\_$subsequences$()$

File $"/$home$/$runner$/$local$/$submission$/$LCSMatrix$.$py$",$ line $46,$ in get$\_$longest$\_$common$\_$subsequences

self.$\_$find$\_$lcs$($self$.$row$\_$count, self.column$\_$count, $"",$ result$)$

File $"/$home$/$runner$/$local$/$submission$/$LCSMatrix$.$py$",$ line $54,$ in $\_$find$\_$lcs

if self.str$1[$i $-1]==$ self.str$2[$j $-1]$:

AttributeError: 'LCSMatrix' object has no attribute $\text{'}$str$1\text{'}$