The green arrows in the top left corner of a cell indicate that there is an error or inconsistency in the formula or data in that cell. This could be due to a variety of reasons such as a missing reference, a circular reference, or a formula that is not valid.

In the case of your formula, the green arrow could be indicating that there is an error in the formula or that the data in the cell is not in the correct format for the to work properly.

To troubleshoot this issue, you can try the following steps:

1. Click on the cell with the green arrow to see what the error message is. This will give you a better idea of what the issue is.
2. Check the format of the data in the cell. Make sure that it is in the correct format for the
   Code:

   vlookup

   formula to work. For example, if you are looking up a value in a table of numbers, make sure that the data in the cell is also a number.
3. Check the syntax of your
   Code:

   vlookup

   formula. Make sure that all of the arguments are correct and that you are referencing the correct table and column.
4. If you are still having issues, try using the "Evaluate Formula" tool in Excel to step through your
   Code:

   vlookup

   formula and see where the error is occurring.

By following these steps, you should be able to identify and resolve the issue with the green arrow in your formula.