Some help needed

Please use the SRC button to post code . . .

Splits the string at the semicolons, converts the substrings into doubles, and stores values into the dynamic array.

The thing that you mentioned is ok. problem is in the rest of the code. I get two errors (in new metaeditor only).

'init' - function can be declared only in the global scope

and

'init' - function already defined and has body

Sounds like you have declared init() inside another function and then defined it a second time . . .

yes i've got that and corrected. Now getting error in timeframe code.

   //--- EA PARAMETERS
extern int      EA_TF=240;
extern bool     Forced_TF=True;


bool   TF;

     if(Forced_TF != True) TF = EA_TF;     //These two lines i think, have error.
     else TF = Period();                   //New metaeditor is not accepting "TF = EA_TF;" from above line.

If Forced_TF is true, then EA should trade and should get signals from mentioned timeframe only, even if active chart (on which i place EA) is opened in different timeframe. If value false, then it should work on any timeframe.

You have TF as a bool . .. but you are trying to set it to an int . . . try this . . .

   //--- EA PARAMETERS
extern int      EA_TF=240;
extern bool     Forced_TF=True;


int   TF;

     if(!Forced_TF) TF = EA_TF;     //These two lines i think, have error. 
     else TF = Period();            //New metaeditor is not accepting "TF = EA_TF;" from above line.

Post ALL the code or at least indicate the truncation. That IF/ELSE must be inside a function.

@RaptorUK I've got you. and again everything ok with old editor, but new editor still giving one warning, quoted in code after error line,

//+------------------------------------------------------------------+
//|                                                   01Multi_EA.mq4 |
//|                      Copyright © 2004, MetaQuotes Software Corp. |
//|                                       http://www.metaquotes.net/ |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2004, MetaQuotes Software Corp."
#property link      "http://www.metaquotes.net/"
#property version   "1.00"
#property strict

//--- input parameters
input int      EA_TF=60;
input bool     Forced_TF=True;
input int      MagicNumber=12345;
input int      FastMA_Period=5;
input int      FastMA_Shift=0;
input int      FastMA_Method=1;
input int      FastMA_Price=0;
input int      SlowMA_Period=34;
input int      SlowMA_Shift=0;
input int      SlowMA_Method=1;
input int      SlowMA_Price=0;
input string   LotsProgression="0.01;0.02;0.03;0.04;0.05;0.06;0.07;0.08;0.09;0.10;0.11;0.12;0.13;0.14;0.15;0.16;0.17;0.18;0.19;0.20";
input bool     NewCycle=True;
input int      Limit_TP=50;
input bool     Use_TP=False;
input int      Limit_SL=50;
input bool     Use_SL=False;
input int      MaxSlippage=3;
input int      OrderTries=10;

int      TF, Plen;
double   TP, SL, pips2dbl, pips2point, pipValue, Slippage, Lots[];
         
//+------------------------------------------------------------------+
//| Expert initialization function                                   |
//+------------------------------------------------------------------+
int OnInit()
  {
//----
 if(Forced_TF != True) TF = EA_TF;
      else TF = Period();
   int i,j,k;
   string ls;
   while (true) {
        j=StringFind(LotsProgression,";",i);
        if(j>0) {
                ls=StringSubstr(LotsProgression,i,j-i);    // <<<<<"possible use of uninitialized variable 'i'	01Multi_EA.mq4	46	38">>>>>

                i=j+1;
                k++;
                ArrayResize(Lots,k);
                Lots[k-1]=StrToDouble(ls);
        } else {
                ls=StringSubstr(LotsProgression,i);
                k++;
                ArrayResize(Lots,k);
                Lots[k-1]=StrToDouble(ls);
                break;
        }
   }


   Comment("Copyright © 2004, MetaQuotes Software Corp.");
   
   if (Digits == 5 || Digits == 3)
   {            
      pips2dbl = Point*10; pips2point = 10; pipValue = (MarketInfo(Symbol(),MODE_TICKVALUE))*10;
   } 
   else 
   {    
      pips2dbl = Point;   pips2point = 1; pipValue = (MarketInfo(Symbol(),MODE_TICKVALUE))*1;
   }
   
   Slippage = pips2dbl*MaxSlippage;
   TP = pips2dbl*Limit_TP;
   SL = pips2dbl*Limit_SL;
   
//----
   return(INIT_SUCCEEDED);
  }

@WHRoeder Pasted the whole code.

It's not an error it's a warning . . . to get rid of the warning initialise the variable rather than just declaring it. In mql4 when you declared a variable it was also initialised, now with mql4.5 you have to explicitly initialise the variable if you want to . . .

int i = 0, j, k;   //  i initialised to 0

pipValue = (MarketInfo(Symbol(),MODE_TICKVALUE))*10;

Don't use tickvalue by itself https://www.mql5.com/en/forum/133792/page3#512466