Failed when execute 'spark core remove' in local cloud

@kennethlimcp Thanks your reply , I just added and then removed ,still the some issue.

B.T.W, I recoved Factory mode, and then It is first White(no flash), and then flash with Green ,and then flash Red when i plugin USB, and looped upon steps. below is logs in server console.

1: Core disconnected: socket error Error: read ECONNRESET { coreID: '53ff74065075535141251681',
cache_key: '_151',
duration: 258.247 }
Session ended for _151
1: Core disconnected: socket error Error: read ECONNRESET { coreID: '53ff74065075535141251681',
cache_key: '_152',
duration: 25.01 }
Session ended for _152
Connection from: 192.168.1.106, connId: 154
on ready { coreID: '53ff74065075535141251681',
ip: '192.168.1.106',
product_id: 0,
firmware_version: 7,
cache_key: '_153' }
Core online!
Connection from: 192.168.1.106, connId: 155
on ready { coreID: '53ff74065075535141251681',
ip: '192.168.1.106',
product_id: 0,
firmware_version: 7,
cache_key: '_154' }
Core online!
1: Core disconnected: socket error Error: read ECONNRESET { coreID: '53ff74065075535141251681',
cache_key: '_153',
duration: 25.004 }
Session ended for _153
Connection from: 192.168.1.106, connId: 156
on ready { coreID: '53ff74065075535141251681',
ip: '192.168.1.106',
product_id: 0,
firmware_version: 7,
cache_key: '_155' }
Core online!
1: Core disconnected: socket error Error: read ECONNRESET { coreID: '53ff74065075535141251681',
cache_key: '_154',
duration: 25.017 }
Session ended for _154
Connection from: 192.168.1.106, connId: 157
on ready { coreID: '53ff74065075535141251681',
ip: '192.168.1.106',
product_id: 0,
firmware_version: 7,
cache_key: '_156' }
Core online!
1: Core disconnected: socket error Error: read ECONNRESET { coreID: '53ff74065075535141251681',
cache_key: '_155',
duration: 25.013 }
Session ended for _155
Connection from: 192.168.1.106, connId: 158
on ready { coreID: '53ff74065075535141251681',
ip: '192.168.1.106',
product_id: 0,
firmware_version: 7,
cache_key: '_157' }
Core online!
1: Core disconnected: socket error Error: read ECONNRESET { coreID: '53ff74065075535141251681',
cache_key: '_156',
duration: 25.008 }
Session ended for _156
Connection from: 192.168.1.106, connId: 159
on ready { coreID: '53ff74065075535141251681',
ip: '192.168.1.106',
product_id: 0,
firmware_version: 7,
cache_key: '_158' }
Core online!
1: Core disconnected: socket error Error: read ECONNRESET { coreID: '53ff74065075535141251681',
cache_key: '_157',
duration: 25.021 }
Session ended for _157
Connection from: 192.168.1.106, connId: 160
on ready { coreID: '53ff74065075535141251681',
ip: '192.168.1.106',
product_id: 0,
firmware_version: 7,
cache_key: '_159' }
Core online!
1: Core disconnected: socket error Error: read ECONNRESET { coreID: '53ff74065075535141251681',
cache_key: '_158',
duration: 25.015 }
Session ended for _158
Connection from: 192.168.1.106, connId: 161
on ready { coreID: '53ff74065075535141251681',
ip: '192.168.1.106',
product_id: 0,
firmware_version: 7,
cache_key: '_160' }
Core online!
1: Core disconnected: socket error Error: read ECONNRESET { coreID: '53ff74065075535141251681',
cache_key: '_159',
duration: 25.003 }
Session ended for _159
Connection from: 192.168.1.106, connId: 162
on ready { coreID: '53ff74065075535141251681',
ip: '192.168.1.106',
product_id: 0,
firmware_version: 7,
cache_key: '_161' }
Core online!
1: Core disconnected: socket error Error: read ECONNRESET { coreID: '53ff74065075535141251681',
cache_key: '_160',
duration: 25.007 }
Session ended for _160
Connection from: 192.168.1.106, connId: 163
on ready { coreID: '53ff74065075535141251681',
ip: '192.168.1.106',
product_id: 0,
firmware_version: 7,
cache_key: '_162' }
Core online!
1: Core disconnected: socket error Error: read ECONNRESET { coreID: '53ff74065075535141251681',
cache_key: '_161',
duration: 25 }
Session ended for _161
Connection from: 192.168.1.106, connId: 164
on ready { coreID: '53ff74065075535141251681',
ip: '192.168.1.106',
product_id: 0,
firmware_version: 7,
cache_key: '_163' }
Core online!
1: Core disconnected: socket error Error: read ECONNRESET { coreID: '53ff74065075535141251681',
cache_key: '_162',
duration: 25.006 }
Session ended for _162
Connection from: 192.168.1.106, connId: 165
on ready { coreID: '53ff74065075535141251681',
ip: '192.168.1.106',
product_id: 0,
firmware_version: 7,
cache_key: '_164' }
Core online!
1: Core disconnected: socket error Error: read ECONNRESET { coreID: '53ff74065075535141251681',
cache_key: '_163',
duration: 25.015 }
Session ended for _163
Connection from: 192.168.1.106, connId: 166
on ready { coreID: '53ff74065075535141251681',
ip: '192.168.1.106',
product_id: 0,
firmware_version: 7,
cache_key: '_165' }
Core online!