install domain mapping not working

I proceeded to install the plugin "Domain Mapping" as described in the manual, on the administration panel I have this error message:

https://hubic.com/home/browser/thumb/?uri=default/FireShot%20Screen%20Capture%20%23272%20-%20%27Domain%20Mapping%20%E2%80%B9%20Admin%20du%20r%C3%A9seau%C2%A0_%20R%C3%A9seau%20Web%27%20-%20reseauweb_fr_wp-admin_network_settings_php_page%3Ddomainmapping_options.png&crop=no&size=1920x868

When I fill the field and change the dns redirection is not done properly and I get on this page :

https://hubic.com/home/pub/thumb/?url=https%3A//lb1.hubic.ovh.net/v1/AUTH_32dd6a5c4c63c7b092e027c5fabb53aa/default/FireShot%2520Screen%2520Capture%2520%2523270%2520-%2520%2527Cr%25C3%25A9er%2520un%2520site%2520pro%2520gratuit%2520ou%2520votre%2520boutique%2520ecommerce%2527%2520-%2520reseauweb_fr_wp-signup_php_new%253Dalexandrelucien_fr.png%3Ftemp_url_sig%3Df3a0322543f91a8a94f8677dde65f4db3cd759ee%26temp_url_expires%3D1398082663&crop=no&size=1920x868

screenshot dns a registar :

https://hubic.com/home/browser/thumb/?uri=default/FireShot%20Screen%20Capture%20%23271%20-%20%27Manager%20OVH%27%20-%20www_ovh_com_managerv3_hosting-domain-zone_pl.png&crop=no&size=1920x868

screenshot configuration :

https://hubic.com/home/pub/thumb/?url=https%3A//lb1.hubic.ovh.net/v1/AUTH_32dd6a5c4c63c7b092e027c5fabb53aa/default/FireShot%2520Screen%2520Capture%2520%2523273%2520-%2520%2527Domain%2520Mapping%2520%25E2%2580%25B9%2520Admin%2520du%2520r%25C3%25A9seau%25C2%25A0_%2520R%25C3%25A9seau%2520Web%2527%2520-%2520reseauweb_fr_wp-admin_network_settings_php_page%253Ddomainmapping_options%2526saved%253Dtrue.png%3Ftemp_url_sig%3D33f0b5670d83ff1bebb281d3dd16864a335b8ee2%26temp_url_expires%3D1398083164&crop=no&size=1920x868

configuration :

wordpress 3.8 multisite
Server Linux
Parallels Plesk 11.5.30 (64 bits)

Is that I forgot a step?

Thank you for your help