Not importing to database , simply not working.

Friends,
My node import just not working

In step 1 iam getting the fields to select the file and the content type, after hitting the button it redirect to another page. there it showing the datas and the fields for mapping , after mapping the datas when i click on the submit button it redirecting to the previous page. nothing is importing.

what may be the problem.

Is iam wrong , if so please advice me.