Files not visible in Demultiplex Pipeline

Hi All,
I am using flowBio to analyse my CLIP data. However I am currently having problems with a very early step - After uploading my data, it does not show up when I go to demultiplex the files. I have tried this will files that I have previously succesfully analysed using the flowbio pathway so dont think its an intrinsic problem to the data.
Any thoughts much appreciated!
Beth