The demo import has finished, but there were some import errors.

Hello,
When I import demo data by this plugin. Showing error like below code. Have you any solution to solve this problem?

[ERROR] Failed to import “One Click Demo Import – log_file_2016-10-26__07-24-57” (Media)
[ERROR] Failed to import “One Click Demo Import – log_file_2016-10-25__12-40-27” (Media)

The demo import has finished, but there were some import errors.
More details about the errors can be found in this log file

And in the log file the code is like this….

—Downloaded files—
The import files for: main-demo were successfully downloaded!
Initial max execution time = 30
Files info:
Site URL = https://just4ucreations.com.au
Data file = /home/content/n3pnexwpnas02_data03/14/3634614/html/wp-content/themes/weddingreval/inc/demos/demo-weddingreval-content.xml
Widget file = /home/content/n3pnexwpnas02_data03/14/3634614/html/wp-content/themes/weddingreval/inc/demos/demo-weddingreval-widgets.wie
Customizer file = not defined!

—Importing content—
[ERROR] Failed to import “One Click Demo Import – log_file_2016-10-26__07-24-57” (Media)
[ERROR] Failed to import “One Click Demo Import – log_file_2016-10-25__12-40-27” (Media)

Max execution time after content import = 300