witnesses you have voted for have retired (or are running a zombie server):
@michalx2008x, these
steemed
You have 16 witness votes left to use.
You are voting for: aggroed, blocktrades, busy.witness, curie, good-karma, gtg, jamzed, ocd-witness, qurator, steemed, steemitboard, stoodkev, wise-team, yabapmatt.
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