The first time didn't send the email, I had to remove the register from the database.
Second time registration was almost finished, but did no add the user to the default group..
It looks that the problem happens with web page over mobile phone.
{"reqId":"I+H8H7/Yz/sk8AdZZIbF","remoteAddr":"132.230.162.5","app":"PHP","message":"Undefined index: errormsgs at /var/www/html/owncloud/apps/registration/templates/form.php#6","level":3,"time":"2015-10-05T13:05:04+02:00"}
{"reqId":"I+H8H7/Yz/sk8AdZZIbF","remoteAddr":"132.230.162.5","app":"PHP","message":"Undefined index: entered_data at /var/www/html/owncloud/apps/registration/templates/form.php#24","level":3,"time":"2015-10-05T13:05:13+02:00"}
{"reqId":"R+jyD3lxoLJIeoU/WEAB","remoteAddr":"132.230.162.5","app":"PHP","message":"Undefined index: user at /var/www/html/owncloud/apps/registration/templates/form.php#24","level":3,"time":"2015-10-05T13:05:51+02:00"}
{"reqId":"8bnGo99XkjbI0S5t9W9H","remoteAddr":"187.176.12.20","app":"core","message":"Sent mail to \"Array\n(\n [[email protected]] => ownCloud User\n)\n\" with subject \"Verifique su solicitud de registro con ownCloud\"","level":0,"time":"2015-10-05T18:17:56+02:00","method":"POST","url":"/index.php/apps/registration/"}
{"reqId":"1X9q3DSd3BDbEkY8B1HB","remoteAddr":"187.176.12.20","app":"core","message":"Sent mail to \"Array\n(\n [[email protected]] => ownCloud User\n)\n\" with subject \"Verifique su solicitud de registro con ownCloud\"","level":0,"time":"2015-10-05T21:07:59+02:00","method":"POST","url":"/index.php/apps/registration/"}
{"reqId":"zSdBNGjBrT8dQARZZYGV","remoteAddr":"187.176.12.20","app":"PHP","message":"Undefined index: errormsgs at /var/www/html/owncloud/apps/registration/templates/form.php#6","level":3,"time":"2015-10-05T21:10:48+02:00","method":"GET","url":"/index.php/apps/registration/verify/+Y9fXS0lxXeYPn2qLccfP5vzShtAtF"}
{"reqId":"zSdBNGjBrT8dQARZZYGV","remoteAddr":"187.176.12.20","app":"PHP","message":"Undefined index: entered_data at /var/www/html/owncloud/apps/registration/templates/form.php#24","level":3,"time":"2015-10-05T21:10:49+02:00","method":"GET","url":"/index.php/apps/registration/verify/+Y9fXS0lxXeYPn2qLccfP5vzShtAtF"}
{"reqId":"ZrbtDpfJBVxzOl8McFK1","remoteAddr":"187.176.12.20","app":"PHP","message":"Call to a member function file_exists() on a non-object at /var/www/html/owncloud/lib/private/files/filesystem.php#688","level":3,"time":"2015-10-05T21:11:21+02:00","method":"POST","url":"/index.php/apps/registration/verify/+Y9fXS0lxXeYPn2qLccfP5vzShtAtF"}
{"reqId":"jL7Z/FmjGFLE4mRYccSN","remoteAddr":"187.176.12.20","app":"PHP","message":"Undefined index: user at /var/www/html/owncloud/apps/registration/templates/form.php#24","level":3,"time":"2015-10-05T21:12:05+02:00","method":"POST","url":"/index.php/apps/registration/verify/+Y9fXS0lxXeYPn2qLccfP5vzShtAtF"}
{"reqId":"qdJqs7f7XJVlgOoJ3ecu","remoteAddr":"187.176.12.20","app":"PHP","message":"Undefined index: user at /var/www/html/owncloud/apps/registration/templates/form.php#24","level":3,"time":"2015-10-05T21:13:54+02:00","method":"POST","url":"/index.php/apps/registration/verify/+Y9fXS0lxXeYPn2qLccfP5vzShtAtF"}