line $34$ gives an error in matlab as 'catch' is invalid matlab synthax, how can this be fixed?

avgShift $=$ compute$\_$end$\_$expiration$\_$average$($shifts$,20)$;

$\%$ Calculate measurements within end$-$expiration window

tolerance $=5$;

inWindowCount $=$ count$\_$end$\_$expiration$\_$window$($shifts$,$ avgShift, tolerance$)$;

inWindowPercentage $=($inWindowCount $/$ length$($shifts$))*100$;

$\%$ Save results to a file

save$\_$results$\_$to$\_$file$(\text{'}$results$.$txt$\text{'},$ shifts, avgShift, tolerance$)$;

$\%$ Plot shifts

timePoints $=$ linspace$(0,10,$ length$($shifts$))$;

plot$\_$shifts$($shifts$,$ avgShift, tolerance, timePoints$)$;

$\%$ Display results

fprintf$(\text{'}$Average shift in end$-$expiratory position: $\%\mathrm{.}6$f

$\text{'},$ avgShift$)$;

fprintf$(\text{'}$Percentage of measurements within gating window: $\%\mathrm{.}6$f$\%\%$

$\text{'},$ inWindowPercentage$)$;

catch ME

fprintf$(\text{'}$Error: $\%$s

$\text{'},$ ME$.$message$)$;

end

function bestShift $=$ calculate$\_$shift$($referenceSignal$,$ targetSignal$)$

minIndex $=20$;

maxIndex $=80$;

bestMSE $=$ inf;

bestShift $=0$;

for shift $=-10$:$10$

shiftedSignal $=$ circshift$($targetSignal$,$ shift$)$;

mse $=$ calculate$\_$mse$($referenceSignal$,$ shiftedSignal, minIndex, maxIndex$)$;

if mse $$ bestMSE

hestMSF $=$ mse: