title: Project in Spring Tool Suite report "Unable to load annotation processor factory"
body: <p>My project in Spring Tool Suite report Unable to "load annotation processor factory 'org.springframework.boot.configurationprocessor.ConfigurationMetadataAnnotationProcessor' for project XXX", My project runs fine, but I do not want to see this error.I did a lot of searching, but I could not find any result.
  Thanks a lot.</p>
  
  <p><a href="https://i.stack.imgur.com/et1aJ.png" rel="noreferrer"><img src="https://i.stack.imgur.com/et1aJ.png" alt="enter image description here"></a>  </p>