Plot LefSe Results error

I was able to run hmp_small_aerobiosis.txt thru LefSe pipeline. However, I get stuck at 3rd step, Plot LefSe Results with my own data. I think I have formatted the file correctly. When I click on View Data, I get following error " The image “http:/huttenhower.sph.harvard.edu/galaxy/datasets/1912cb218a5f7452/display/?preview=True” cannot be displayed because it contains errors." When I click on Edit attributes, I get error “No differentially abundant features found in /export/galaxy-central/database/files/003/651/dataset_3651196.dat”. I would appreciate if you could help me with this. Thanks. Gurjit