Undeclared Identifier error in Pinescript while translating study script to strategy

I am trying to convert Chandelier Stop study script to strategy but getting Undeclared Identifier error in version=4

The original script can be found here - https://in.tradingview.com/script/mjBdRGXe-Chandelier-Stop/

  //input variables  Length2=input(title="Look Back Period", type=input.integer, defval=22)  ATRPeriod=input(title="ATR Period", type=input.integer, defval=22)  Mult=input(title="ATR Multiplier", type=input.integer, defval=3)    //calculate stop value  short_stop = lowest(Length2)+Mult*atr(ATRPeriod)  long_stop  = highest(Length2)-Mult*atr(ATRPeriod)    shortvs=na(shortvs[1]) ? short_stop : iff(close>shortvs[1], short_stop , min(short_stop,shortvs[1]))  longvs=na(longvs[1]) ? long_stop : iff(close<longvs[1], long_stop, max(long_stop,longvs[1]))    longswitch=iff (close>=shortvs[1] and close[1]<shortvs[1] , 1 ,  0)  shortswitch=iff (close<=longvs[1] and close[1]>longvs[1] ,  1 ,  0)    direction= iff(na(direction[1]), 0, iff (direction[1]<=0 and longswitch, 1, iff (direction[1]>=0 and shortswitch, -1, direction[1])))                pcup=direction>0?longvs : na  pcdn=direction<0?shortvs : na    plot(pcup, color=color.aqua, style=plot.style_circles, linewidth=2)  plot(pcup, color=color.aqua, style=plot.style_linebr, linewidth=2)    plot(pcdn, color=color.fuchsia, style=plot.style_circles, linewidth=2)  plot(pcdn, color=color.fuchsia, style=plot.style_linebr, linewidth=2)  

Here is Error Log

Processing script...  line 35: Undeclared identifier 'shortvs';  line 36: Undeclared identifier 'longvs';  line 38: Undeclared identifier 'shortvs';  line 39: Undeclared identifier 'longvs';  line 41: Undeclared identifier 'direction';  line 41: Undeclared identifier 'longswitch';  line 41: Undeclared identifier 'shortswitch';  line 43: Undeclared identifier 'direction';  line 43: Undeclared identifier 'longvs';  line 44: Undeclared identifier 'direction';  line 44: Undeclared identifier 'shortvs';  line 53: Undeclared identifier 'direction';  line 57: Undeclared identifier 'direction';  line 118: Undeclared identifier 'pcup';  line 119: Undeclared identifier 'pcup';  line 121: Undeclared identifier 'pcdn';  line 122: Undeclared identifier 'pcdn'  

https://stackoverflow.com/questions/66480550/undeclared-identifier-error-in-pinescript-while-translating-study-script-to-stra March 05, 2021 at 01:59AM