JIRA Importers Plugin (JIM) getting java.lang.NoClassDefFoundError

When attempting to import some data we've got the following error:

java.lang.NoClassDefFoundError:
com/atlassian/greenhopper/customfield/epiclink/EpicLinkCFType

JIRA version: 6.2.6
JIM version: 6.1.12
JIRA Agile Version: 6.3.13.1

Although when we've tried with JIM 6.1.6 it worked properly.

Please refer the sample CSV enclosed.