Fail: Replacing site url has been failed

Hello, I try to create a staging site but it fails when trying to replace the links: http://i.imgur.com/l9LPsNs.png

### Begin System Info ###

— Site Info

Site URL: http://j256895.servers.jiffybox.net
Home URL: http://j256895.servers.jiffybox.net
Multisite: No

— User Browser

Platform: Windows
Browser Name: Chrome
Browser Version: 46.0.2490.80
User Agent String: Mozilla/5.0 (Windows NT 10.0; WO
W64) AppleWebKit/537.36 (KHTML,
like Gecko) Chrome/46.0.2490.80
Safari/537.36

— WordPress Configuration

Version: 4.3.1
Language: en_US
Permalink Structure: /%postname%/
Active Theme: Twenty Thirteen 1.6
Show On Front: posts
Remote Post: wp_remote_post() works
Table Prefix: Length: 3 Status: Acceptable
WP_DEBUG: Disabled
Memory Limit: 40M
Registered Post Stati: publish, future, draft, pending, private, trash, auto-draft, inherit

— WPSTG Configuration

Version: 0.9.7
Upgraded From: 0.9.7

— WordPress Active Plugins

Akismet: 3.1.5
Amazon Bestseller for WordPress: 1.7.0
SSH SFTP Updater Support: 0.7.1
WordPress Importer: 0.6.1
WP Staging – Create a staging clone site for testing & developing: 0.9.7
Yoast SEO: 2.3.5

— WordPress Inactive Plugins

— Webserver Configuration

PHP Version: 5.6.99-hhvm
MySQL Version: 5.5.46
Webserver Info: nginx/1.4.6

— PHP Configuration

Safe Mode: Disabled
Memory Limit: 256M
Upload Max Size:
Post Max Size:
Upload Max Filesize:
Time Limit: 0
Max Input Vars:
Display Errors: On (1)

— PHP Extensions

cURL: Supported
fsockopen: Supported
SOAP Client: Installed
Suhosin: Not Installed

### End System Info ###

Any ideas?

Best regards

https://wordpress.org/plugins/wp-staging/