Fitnesse: Populate data in grid without label

Hello everyone, 

I have written a Fitnesse  script  for writing data into Grid (without label ) that clicks on add row link of grid and populate first column of grid. The first column is a simple text field, but FitNesse is failing to write the data into this field. 

FitNesse for Appian version: 21.1 Appian version: 20.4
!| script  
|click on link|Add row|
| wait for | 5 seconds |
|populate grid|1|column|1|row|12|with|TEST data|
|click on button|SUBMIT|
***!

The error message that I receive is as follows:

Timeout period reached: wait for grid cell - 1

Thank you!