When call xml rpc api request User couldn't be authenticated, aborting call

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Hello,

I have the problem  when  i call the api request in opennebula the following error will be occured

Mon Nov 14 15:29:56 2016 [Z0][ReM][D]: Req:6048 UID:0 VirtualMachinePoolInfo invoked , -2, -1, -1, -1
Mon Nov 14 15:29:56 2016 [Z0][ReM][D]: Req:6048 UID:0 VirtualMachinePoolInfo result SUCCESS, "<VM_POOL></VM_POOL>"
Mon Nov 14 15:29:56 2016 [Z0][ReM][D]: Req:8848 UID:0 VirtualMachinePoolInfo invoked , -2, -1, -1, -1
Mon Nov 14 15:29:56 2016 [Z0][ReM][D]: Req:8848 UID:0 VirtualMachinePoolInfo result SUCCESS, "<VM_POOL></VM_POOL>"
Mon Nov 14 15:30:08 2016 [Z0][MKP][D]: Monitoring marketplace OpenNebula Public (0)
Mon Nov 14 15:30:08 2016 [Z0][InM][D]: Monitoring datastore default (1)
Mon Nov 14 15:30:08 2016 [Z0][InM][D]: Monitoring datastore files (2)
Mon Nov 14 15:30:09 2016 [Z0][ImM][D]: Datastore files (2) successfully monitored.
Mon Nov 14 15:30:09 2016 [Z0][ImM][D]: Datastore default (1) successfully monitored.
Mon Nov 14 15:30:11 2016 [Z0][MKP][D]: Marketplace OpenNebula Public (0) successfully monitored.
Mon Nov 14 15:30:26 2016 [Z0][ReM][D]: Req:4576 UID:0 VirtualMachinePoolInfo invoked , -2, -1, -1, -1
Mon Nov 14 15:30:26 2016 [Z0][ReM][D]: Req:4576 UID:0 VirtualMachinePoolInfo result SUCCESS, "<VM_POOL></VM_POOL>"
Mon Nov 14 15:30:26 2016 [Z0][ReM][D]: Req:2640 UID:0 VirtualMachinePoolInfo invoked , -2, -1, -1, -1
Mon Nov 14 15:30:26 2016 [Z0][ReM][D]: Req:2640 UID:0 VirtualMachinePoolInfo result SUCCESS, "<VM_POOL></VM_POOL>"
Mon Nov 14 15:30:53 2016 [Z0][AuM][E]: User: 9350a0c4b2e61f8dcf9ac5b9d504bad5a2e71928 does not exist. Returned by server auth
Mon Nov 14 15:30:53 2016 [Z0][ReM][D]: Req:5376 UID:-1 TemplatePoolInfo invoked , -2, 3, 3
Mon Nov 14 15:30:53 2016 [Z0][ReM][E]: Req:5376 UID:- TemplatePoolInfo result FAILURE [TemplatePoolInfo] User couldn’t be authenticated, aborting call.
Mon Nov 14 15:30:56 2016 [Z0][ReM][D]: Req:7728 UID:0 VirtualMachinePoolInfo invoked , -2, -1, -1, -1
Mon Nov 14 15:30:56 2016 [Z0][ReM][D]: Req:7728 UID:0 VirtualMachinePoolInfo result SUCCESS, "<VM_POOL></VM_POOL>"
Mon Nov 14 15:30:56 2016 [Z0][ReM][D]: Req:1488 UID:0 VirtualMachinePoolInfo invoked , -2, -1, -1, -1
Mon Nov 14 15:30:56 2016 [Z0][ReM][D]: Req:1488 UID:0 VirtualMachinePoolInfo result SUCCESS, "<VM_POOL></VM_POOL>"
Mon Nov 14 15:31:04 2016 [Z0][MKP][D]: Monitoring marketplace OpenNebula Public (0)
Mon Nov 14 15:31:04 2016 [Z0][InM][D]: Monitoring datastore default (1)
Mon Nov 14 15:31:04 2016 [Z0][InM][D]: Monitoring datastore files (2)
Mon Nov 14 15:31:05 2016 [Z0][ImM][D]: Datastore files (2) successfully monitored.

we use server_cipher driver.
I have prepared authentication string in this format
username:target_username:secret
for example
serveradmin:megam:9350a0c4b2e61f8dcf9ac5b9d504bad5a2e71928

Is that correct format i prepared the session string?
I have refer this document
http://docs.opennebula.org/5.2/deployment/sunstone_setup/cloud_auth.html#cloud-auth

Please solve those error.