I sent the command :
qiime diversity core-metrics-phylogenetic
I have this results: "There were some problems with the command"
Check out the first error listed in your screenshot:
(1/18) Invalid value for '--output-dir': 'core-metrics-results' already exists, will not overwrite.
This directory already exists from your current location on your machine. You can either delete that existing directory, change the name of your '--output-dir' directory, or move to a different location on your machine to create another 'core-metrics-results' directory.