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after upgrade and reboot the eve ng , seems I cannot boot up the iou node, attached error log below

Apr 07 01:07:24 Apr 07 01:07:24 ERROR: node 7

PHP Warning: unlink(/opt/unetlab/tmp/0/76fe619f-5baa-4568-8ec6-6d104bf5348b/7/suspend_48): No such file or directory in /opt/unetlab/wrappers/unl_wrapper on line 1280

PHP Warning: unlink(/opt/unetlab/tmp/0/76fe619f-5baa-4568-8ec6-6d104bf5348b/7/l1_48): No such file or directory in /opt/unetlab/wrappers/unl_wrapper on line 1279

PHP Warning: unlink(/opt/unetlab/tmp/0/76fe619f-5baa-4568-8ec6-6d104bf5348b/7/suspend_32): No such file or directory in /opt/unetlab/wrappers/unl_wrapper on line 1280

PHP Warning: unlink(/opt/unetlab/tmp/0/76fe619f-5baa-4568-8ec6-6d104bf5348b/7/l1_32): No such file or directory in /opt/unetlab/wrappers/unl_wrapper on line 1279

PHP Warning: unlink(/opt/unetlab/tmp/0/76fe619f-5baa-4568-8ec6-6d104bf5348b/7/suspend_16): No such file or directory in /opt/unetlab/wrappers/unl_wrapper on line 1280

PHP Warning: unlink(/opt/unetlab/tmp/0/76fe619f-5baa-4568-8ec6-6d104bf5348b/7/l1_16): No such file or directory in /opt/unetlab/wrappers/unl_wrapper on line 1279

PHP Warning: unlink(/opt/unetlab/tmp/0/76fe619f-5baa-4568-8ec6-6d104bf5348b/7/suspend_0): No such file or directory in /opt/unetlab/wrappers/unl_wrapper on line 1280

PHP Warning: unlink(/opt/unetlab/tmp/0/76fe619f-5baa-4568-8ec6-6d104bf5348b/7/l1_0): No such file or directory in /opt/unetlab/wrappers/unl_wrapper on line 1279

Apr 07 01:07:24 INFO: started process is 182961

Apr 07 01:07:24 INFO: starting systemctl show --property MainPID --value eveng_0@76fe619f-5baa-4568-8ec6-6d104bf5348b@7

Running as unit: eveng_0@76fe619f-5baa-4568-8ec6-6d104bf5348b@7.service

Apr 07 01:07:24 INFO: starting sudo systemd-run -G --no-block --property=ExecStopPost=/opt/unetlab/go/eve-clean --property=Environment=WDIR="/opt/unetlab/tmp/0/76fe619f-5baa-4568-8ec6-6d104bf5348b/7" --property=Environment=TYPE="iol" --property=WorkingDirectory=/opt/unetlab/tmp/0/76fe619f-5baa-4568-8ec6-6d104bf5348b/7 --service-type=simple --uid=0 --gid=32768 --unit=eveng_0@76fe619f-5baa-4568-8ec6-6d104bf5348b@7 /opt/unetlab/wrappers/iol_wrapper -C 45765 -L 1 -T 0 -D 7 -t "R7" -F /opt/unetlab/addons/iol/bin/i86bi_LinuxL3-AdvEnterpriseK9-M2_157_3_May_2018.bin -d 0 -e 1 -s 0 -- -n 1024 -q -m 1024

Apr 07 01:07:24 INFO: starting /opt/unetlab/wrappers/iol_wrapper -C 45765 -L 1 -T 0 -D 7 -t "R7" -F /opt/unetlab/addons/iol/bin/i86bi_LinuxL3-AdvEnterpriseK9-M2_157_3_May_2018.bin -d 0 -e 1 -s 0 -- -n 1024 -q -m 1024

First
it looks that you did upgrade with running labs
second for support you can always come to EVE Live support chat:
https://www.eve-ng.net/index.php/live-helpdesk/

Use your gmail account to join or create new chat account with own email.