S-1 TOPS Merge Tool Error

I have ran this flowchart over two subswaths of a pair
image
Here’s the first outputunnamed
and the second outputunnamed%20(1)
The merge tool gives the following output:unnamed%20(2)
I have tried adding merge in the graph as well after forming the interferogram. but it gives the same error.
Any help or direction would be appreciated.
Thanks.