Faceing issue with opening wokflow after I added poi appache jar file ,used user defined java class and import java apache

Hi I’m reading excel file to Genrate QR code, using user defiened java class,
import org.apache.poi.ss.usermodel.*; now unable to my workflow to work on after saving with diffrent name also.
(upload://xtwy4nrfmjRVqI2mfmHT7wpE0Nq.png)

@mahesh.sadekar Kindly help resolve this query. thanks.