I happened to find the cause of the problem: jMeter plugin and Basic Report plugin are not installed in my KS 7.8.2.
Basic Report plugin’s change log shows that the plugin has “Max KS Version” to be 7.6.10.
jMeter plugin’s change log shows that the plugin has “Max KS version” to be 6.9.10.
I have Katalon Studio ver 7.8.2. It is understandable that these plugins are NOT installed because of the “Max KS version” settings.
I also checked the change log of Excel keywords plugin and found it does not have “Max KS version” defined. I could install it to my KS 7.8.2.
I downgraded Katalon Studio to ver7.6.6 and installed the Basic Report. It worked fine.
This experiment suggests that “Max KS version” matters.
I would suggest Katalon Team to erase Max KS Version for Basic Report plugin and jMeter plugin.