merapi tool doesn’t detect any phone again


here is log:
13:33:32 > Merapi Updated: 2016-02-03
13:33:32 > Connecting…
13:33:45 > Connection successful,connected state!
13:33:45 > Version: V3.8
13:33:45 > SN: 832-xxx-XXX
13:33:48 > Connecting to server…
13:33:53 > Connecting to server…OK!
13:33:53 > Getting function information from server…
13:33:56 > Getting function information from server…OK!
13:34:13 > Access to functional permissions from server…
13:34:16 > Access to functional permissions from server…OK!
>>Analysis of USB port,Please insert phone USB cable.
13:34:27 >
13:34:31 > failed to open port.
13:34:58 > Access to functional permissions from server…
13:35:01 > Access to functional permissions from server…OK!
>>Analysis of USB port,Please insert phone USB cable.
13:35:13 >
13:35:30 > failed to open port.

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  • fail to open port in merapi tool