There are probably 2 different problems here:
Jasim, did you export your file using wordpress?
mehdiba, a white screen usually indicates a PHP fatal error, where it simply couldn’t recover. This can be caused by misconfiguration, and probably isn’t just the plugin.
Try looking at your PHP error log for the error. If you don’t have access to it, try using the wordpress plugin editor to edit the plugin php file and add:
ini_set(‘display_errors’, 1);
and perform the steps again to cause the white screen. It should print out what happened.
Be sure to take that line out when you’re done.
best of luck!