Help please

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I have a text file with a number on each line, at certain points in the file, (end of image width) I have a character R, I want to find this character in insert printhead offsets, the code below may explain.

file_numR= open("c:/red.jet", "r") 
file_numR2= open("c:/red2.jet","w") 
trace(1) 
lineR = gets(file_numR) 
 for t = 0 to incR do 
	i = equal(lineR,['R']) 
  while i = 0 do             -------- 1 true 0 false 
   puts(file_numR2, (lineR)) 
    lineR = gets(file_numR) 
     i = equal(lineR[1],'R') 
 
  end while 
     a1 = where(file_numR2) 
      i2 = a1-2 
       i1 = seek(file_numR2,i2) 
  for R = 0 to TotalOffset do 
   puts(file_numR2, '\n') 
    puts(file_numR2, "0.xxx")	-- insert test value 
  end for 
     lineR = gets(file_numR) 
      puts(file_numR2, '\n') 
  end for 
 
close(file_numR) 
close(file_numR2) 

But I get this error message..... attempt to subscript an atom (reading from it)

Can anyone tell me what I am doing wrong, please keep it simple, i'm not very bright.

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