attempt to download search index crashed/closed the app

Thanks for the good App for the Bible study!

And thank you for the search index tool for texts.
I love the search tool.

This is what id done.
I synced the ipad mini through iTunes.
Opened the pocketsword, and clicked the search icon (using KJV version)
Before I synced, search tool worked well.
But this time, it asked that if i wanted to install a search index.
i answered yes and the app closed itself.

I thought there were any errors when I synced the ipad.
So i reset all content and settings, after that installed the pocketsword.
And opened the pocketsword and clicked the search icon.
But it asked same. And app closed itself.

Please help me.
Thanks.