Generate Heatmap not working for Metaphlan2 results

I would like to create the Heatmap for the sample analyses in Metaphlan2.

Actually, all work well. But unfortunately, upon creation of the heat map using Generate Heatmap Tool following error was received.

Fatal error: Exit code 1 ()
Traceback (most recent call last):
File “/home/galaxy/galaxy/database/dependencies/_conda/envs/__metaphlan2@2.6.0/bin/”, line 481, in
tax_lev = pars[‘tax_lev’]
File "/home/galaxy/gal

However, the same data is able to show heatmap using Galaxy Europe.

Kindly help me to resolve this error in my server.