LEfSe: tool request failed

Hi, I’m trying to run the first step of LEfSe microbiome analysis from Huttenhower lab
https://huttenhower.sph.harvard.edu/galaxy/ on the left menu, running:
LEfSe: A) Format data for LEfSe

I’m getting the following error for the last two days:

“Tool request failed
Uncaught exception in exposed API method:”

It worked just fine last week. Can someone point me to the right people?

Many thanks in advance, Nevenka