ok, so the first time i think i might have saved the file in hst format (i'm not sure) i just saved it from mt4, and it didn't work. as oposed to exporting the history (not saving it) which stored it as csv file and now it works.

but the thing is the history was quite big, 18 months M1 bars (aprox 500 000 bars). but the program doesn't seam to be able to load more than 50 000 bars which is a way smaller sample.

i went to control panel - data horizon - and changed the maximum data bars to a much higher number than it was, but it can't go higher than 50 000. i also did that to maximum intrabars which doesn't seam to go higher than 100 000.

is there any way to increase those numbers? 50 000 M1 bars are not even close to 'enough'. that is somewhere to 2 weeks. what if i need to backtest 1 year or more of M1 bars? can i do that?

ok, footon and popov thanks alot guys. i had to export the history from mt4 (in csv format) in order to work. and by changing the .json file i was able to change the maximum limit of loaded bars and now the program has loaded all my 550 000 bars.

thanks again guys

Check the directory if the file is there. Next check if the file is correctly named. Thirdly, maybe you need to add it as symbol first in FSB.

Check if everything is OK with H4: name, format, enough amount of bars.
Intrabar scanning means using lower timeframe data to map out higher timeframes. In FSB M1 is the lowest timeframe, therefore there isn't a way to do intrabar scanning, and frankly there is no practical need for it for M1. Pay attention to the number of ambig. bars for strategies, that will tell you if you need intrabar in the first place.

Dear Footon,
I checked H4 timeframe and every thing is Ok with it, but still its chart does not shown. I have found out that this issue also happens with other Indexes( NASDAQ, S&P500,..), however, this issue does not happens once I load Forex currency pairs(EURUSD,...). If there are any other procedures to fix the issue like sorting out the data of that  time frame, would you please guide me?

Thanks

Here is the file for your consideration.

since the time frames lower than H4 are big in terms of file size, I cannot upload them here. I uploaded other time frame of Dow Jones Index which are being load without error here.