Problem following a tutorial in docs.unrealengine

For the warnings, you can go to the “Class Settings” and uncheck “Use Multi Threaded Animation Update”. However, this is will not solve the “Accessed None” error. So, to solve both the warnings and the errors, you will have to change a few things.
For example:

For the* jog_bs to crouch_bs (rule)*:

  • create a new bool variable, IsCPressed;
  • in the transition rule, replace the *GetPlayerController *and WasInputKeyJustPressed, with just IsCPressed
  • in the event graph set this variable:

For the idle_rifle_hip to walk_bs (rule):

  • create a new bool variable, IsInAir;
  • in the transition rule, replace GetPlayerController and* isFalling* with just IsInAir
  • in the event graph set this variable: