The following error occurs when the agent is stopped and restarted.
Can you tell me the cause?

jvm 1 | WrapperManager: Initializing...
jvm 1 | 2020-05-20 14:47:12,917 INFO - Cleaning cached plugin libraries...
jvm 1 | 2020-05-20 14:47:12,961 INFO - Cleaning temp directory...
jvm 1 | 2020-05-20 14:47:12,964 INFO - Benchmarking...
jvm 1 | 2020-05-20 14:47:13,343 INFO - Connecting to server 'http://xx.xxx.xxx.xxx:8810'...
jvm 1 | 2020-05-20 14:47:13,380 INFO - Updating framework...
jvm 1 | 2020-05-20 14:47:13,383 INFO - Updating plugins...
jvm 1 | 2020-05-20 14:47:13,387 INFO - Updating plugins/com.pmease.quickbuild.libs...
jvm 1 | 2020-05-20 14:47:13,389 INFO - Updating plugins/site...
jvm 1 | 2020-05-20 14:47:13,390 INFO - Updating asset...
jvm 1 | 2020-05-20 14:47:13,391 INFO - Booting QuickBuild from '/home/build.qb/buildagent8907'...
jvm 1 | 2020-05-20 14:47:13,392 INFO - Starting framework...
jvm 1 | 2020-05-20 14:47:13,415 INFO - Caching plugin libraries...
jvm 1 | WrapperStartStopApp:
jvm 1 | WrapperStartStopApp Error: Encountered an error running start main: java.lang.reflect.InvocationTargetException
jvm 1 | WrapperStartStopApp Error: java.lang.reflect.InvocationTargetException
jvm 1 | WrapperStartStopApp Error: at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
jvm 1 | WrapperStartStopApp Error: at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
jvm 1 | WrapperStartStopApp Error: at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
jvm 1 | WrapperStartStopApp Error: at java.lang.reflect.Method.invoke(Method.java:498)
jvm 1 | WrapperStartStopApp Error: at com.pmease.quickbuild.bootstrap.Bootstrap.boot(Bootstrap.java:616)
jvm 1 | WrapperStartStopApp Error: at com.pmease.quickbuild.bootstrap.Bootstrap.main(Bootstrap.java:129)
jvm 1 | WrapperStartStopApp Error: at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
jvm 1 | WrapperStartStopApp Error: at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
jvm 1 | WrapperStartStopApp Error: at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
jvm 1 | WrapperStartStopApp Error: at java.lang.reflect.Method.invoke(Method.java:498)