Failed to start bean ‘documentationPluginsBootstrapper‘； nested exception is java.lang.NullPointerEx

SpringBoot集成swagger和knife4j时启动报错 swagger版本是3.0.0 knife4j版本是3.0.3
错误信息：
org.springframework.context.ApplicationContextException: Failed to start bean 'documentationPluginsBootstrapper'; nested exception is java.lang.NullPointerException
at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:181)
at org.springframework.context.support.DefaultLifecycleProcesso

Failed to start bean ‘documentationPluginsBootstrapper‘； nested exception is java.lang.NullPointerEx最先出现在Python成神之路。