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

Cell In$[10],$ line $7$

$4$ model.add$($layers$.$Flatten$($input$\_$shape$=$self.input$\_$shape$))$

$6$ for i in range$($hp$.$Int$(\text{'}$num$\_$layers', min$\_$value$=1,$ max$\_$value$=3))$:

$---->7$ model.add$($layers$.$Dense$($units$=$hp$.$Int$(\text{'}$units$\_\text{'}+$ str$($i$),$ min$\_$value$=32,$ max$\_$value$=512,$ step$=32),$ activation$=$'relu'$))$

$9$ # Dropout rate $($except the last layer$)$

$10$ if i $<($hp$.$Int$(\text{'}$num$\_$layers'$)-1)$:

NameError: name 'model' is not defined

It's an error, how to remove this error?