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well, didn't you just start a new discussion?
I think due to upgrade process this happens.
Check this also.
ANNOUNCEMENT:Community upgrade and read-only announcementby moniquevdb-Oracle (27 July, 2016)
We will be doing a community upgrade on Friday, July 30. The community will be in a read-only state for approximately 7.5 hours, from 21:00 Friday - 04:30
Saturday PT (05:00 - 12:30 Saturday UTC). For more information, click the title of this announcement.