Select band in Batch processing with S1

Dear all,

I am a new user and I work on coherence estimation. I have 15 pairs of S1B images with 12-days temporal baseline and what I want to do is to select only the coherence band from each pair of images(Currently I have all the bands). For this purpose, I created a graph as the attached image and then I tried to use the Batch Processing but with no success. From the Batch Processing, I only get the coherence band for the first pair of images and then I get the following error.

Does anyone has any experience with a similar error?

Thank you.