Developer preview it shows 80072ee7 error

While check for update for 8.1 preview my L520 shows (80072ee7) error.
how to solve it.

is your battery saver off???

S my battery saver is in off only.

Go to settings, emails. Does your MS account says "attention required".

Every thing looks fine. It won't show anything like that.

Is your wifi connected properly?

first off the wifi
then use mobile data to start update
as soon as update start ,start the wifi and stop mobile data

same problem with me ,i solved like this

Thanks Nishad it's work for me.