contact form DB doesn’t make List from My SQL

I use cont form 7 and contact form DB.
My SQL has many Contact form making data.
I can confirm My SQL DB table and something.
When I select contact form DB, But not making list.
And Export some file( ex, CSV), System make file,
But file doesn’t have data.
Please let me know how to resolve this issue.
as below, My System version Information.
System FreeBSD 9.1-RELEASE-p24
PHP 5.4.45
MySQL 5.5.59-log
Contact form 7 3.6
Contact Form DB 2.6.3

Thank you for your helps.