Not all pins could be reached on the net. Check connections

nobody_a

Not analyzed:

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[Warning]    PCB1-20170524.PcbDoc    Signal Integrity    CLK1: Not all pins could be reached on the net.  Check connections.    10:04:09 AM    5/25/2017    335
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nobody_a

这几个红色区域是什么意思？ Not analyzed??