In Katalon Studio, open your project and in the tool bar call Project > Settings
then select the menu External Libraries:
Do you find commons-csv-1.8.jar there?
Maven Central provides an immediate link to the jar:
https://mvnrepository.com/artifact/org.apache.commons/commons-csv/1.8
Try to delete lib, bin folders, close the project and re-open it again to make sure the libraries are loaded. If that still doesn’t resolve the problem, chances are the libraries (jar files) you put into External Libraries don’t have the needed APIs.
Ok thank you,I will try.