Pseudocodes has some errors can someone please help determining what/these errors are thank you

/ Program passes an array to a method that reverses

// the positions of the values

start

Declarations

num LENGTH = 4

num vals[LENGTH] = 33, 55, 77, 99

num sub

output "At beginning of main() method..."

sub = 0

if sub < LENGTH

output vals[sub]

sub = sub + 1

endif

reverseTheValues(vals)

output "At end of main() method.........."

sub = 0

while sub < LENGTH

output vals[sub]

sub = sub + 1

endwhile

stop

void reverseTheValues(num values)

num temp

temp = values[0]

values[0] = values[3]

temp = values[1]

values[1] = values[2]

values[2] = temp

return