I am uploading a csv using apex programming to upload data to my custom object. I am getting this error while uploading csv file. Some the same is uploading correctly. Can one tell how to resolve this. I tried a lot but i couldn't resolve this.

Error: List index out of bounds: 5 Error is in expression '{!ReadFile}' in page

for (Integer i=1;i < filelines.size();i++)
     String[] inputconvalues = new String[]{};
     inputconvalues = filelines[i].split(',');
     Contact con = new Contact();
     for(Account a: accstoupload)
          con.AccountId =accstoupload[i-1].id;
     if(con.AccountId!= null)
          con.Lastname = inputconvalues[36];
          con.Email = inputconvalues[37];
          con.Phone = inputconvalues[38];
     insert contoupload;
catch (Exception e1)
    ApexPages.Message errormsg = new ApexPages.Message(ApexPages.severity.INFO,'Account Name associate with this Contact already exist ');
return null;
  • 2
    Udaya you really need to clean this question up - for starters try to post only the relevant code, correctly formatted (there's a button in the editor to help) and demonstrate what you've tried.
    – Matt Lacey
    May 17, 2013 at 6:36
  • I did some cleaning up, however, your code isn't complete, for example a try without a catch, what is the accstoupload. How are we supposed to help when you don't give a clear picture of your code.
    – pjcarly
    May 17, 2013 at 6:56
  • On first sight, could it be this line inputconvalues = filelines[i].split(','); shouldn't it be inputconvalues = filelines[i-1].split(',');
    – pjcarly
    May 17, 2013 at 6:58
  • thanks for reply PJC i tried but getting same error
    – Udaya
    May 17, 2013 at 7:01

2 Answers 2


This error occurs when you try to reference by index something in a list that does not exist. You have two lists in the sample code above 'inputconvalues' and 'accstoupload'.

inputconvalues. To receive this kind of error when using inputconvalues[] it would likely be due to one of the rows in your CSV file not having the correct number of columns in it. You can resolve this by correcting your CSV file and/or by adding some defensive code to check the size of the inputconvalues list via the size() method before accessing elements by index via inputconvalues[].

accstoupload. This looks like your code is assuming this list has the same number of items in it as the rows in your CSV file. Are you 100% sure this is the case, if not you would receive this error when your code started to process CSV rows towards the end of the file. Try giving a file with one row to test this theory.

Debug Tips:

  • Read this first. Debugging general docs.
  • ApexPage Messages. Rather than reading through large Debug Logs, I've sometimes used ApexPages.addMessage to output debug info. Try adding some of these to check the size of your two lists, you will need to comment out the lines of code accessing them to avoid the error temporarily.
  • Stack Dumps via Developer Mode.. A quick way to get some clarity on which line number is causing the error is to move to Developer Mode via the Developer Mode field on your User record (I don't recommend staying in this for long, its to slow on your VF pages). This will surface in the browser when the error occurs the line number in your code.

The error message you are getting is saying that on some point, your apex code is trying to access an index in an array that doesn't exist, I suggest Debugging your code to see where it goes wrong.

Debugging Apex

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .