Find the error in the following python code:

import time

def current$\_$milli$\_$time$()$:

return round$($time$.$time$()*1000)$

def is$\_$prime$($x$)$:

prime $=$ True

if x $==1$:

return False

else:

for i in range$(2,$ x$-1)$:

if $($x $\%$ i$)==0$:

prime $=$ False

return prime

rs $=1000$

re $=40000$

start $=$ current$\_$milli$\_$time$()$

for i in range$($rs$,$ re$)$:

if is$\_$prime$($i$)$:

print$($i$,"$is prime"$)$

end $=$ current$\_$milli$\_$time$()$

print$(($re$-$rs$),$ "numbers searched in$",$ end$-$start, "milliseconds"$)$