Emirhan Yiğit

Thank you so much for the reply.

I tried to use "with Transaction", yet I don't know if I used it in the correct way and if it did a difference. I was able to import the table for 2000 rows without a problem but when I tried 3000 rows, it didn't work. 

I also want to share this link about Workbench scripting to automate imported load sets, so that it may be useful for those who face similar problems.

Thank you again for your help! I'll be checking this thread in case any improvement happens.