I cant install payplans

When i try to install, the log says

November 27, 2017, 12:44 am
Successfully changed extension-status.

November 27, 2017, 12:45 am
Going to access following url : http://ppappserver.readybytes.net//index.php?option=com_payplans&;plugin=ppappserver&object=release&action=fetch&username=test&password=test&version=migration&extension_type=file&client_id=0&app_element=migration0.0&app_folder=

November 27, 2017, 12:45 am
Failed to access following url : http://ppappserver.readybytes.net//index.php?option=com_payplans&;plugin=ppappserver&object=release&action=fetch&username=test&password=test&version=migration&extension_type=file&client_id=0&app_element=migration0.0&app_folder=

November 27, 2017, 12:45 am
Migration file {/home/creargpc/public_html/gonight/administrator/components/com_ppinstaller/models/migrate/..php} doest not exist. Please contact to <a href='http://www.jpayplans.com/support/forum/28-payplans20-alpha.html' >PayPlans support Team </a>.