Hi @Deadstar2011 ,
Welcome to SonarSource Community! 
Indeed, the SonarJS plugin version is your problem (see also this similar issue). Here’s the Plugin Version Matrix. You should be using 6.2.2, not 7.4.2.
For 8.9 LTS, many language analyzer plugins are now bundled (i.e. no need to update them separately anymore). There was a change starting in SonarQube 8.5 where first-party language analyzer, authentication, and SCM plugins are now bundled into the core of SonarQube, no longer provided as plugins.
For more details I recommend reading this community guide: SonarQube v8.5 and Beyond: Where did all the plugins go?.