I am getting a calculation #DIV/0! error 

I am inserting data from SSIS 2010 to excel 2013

the number is showing as 

7, 10, 8, 11

cell is formatted as General, and output column as WSTR in SSIS

I just want an average of the cells, I.E =AVERAGE(D28:O28)but it showing #DIV/0!

any ideas how to resolve please team