Does the issue occur in the editor or during gameplay?
both, for different reasons
If it's a gameplay issue, please specify which movement system and camera type you're using (free movement vs. grid movement, third-person vs. first-person) or N/A if not applicable:
Grid, Standard (I doubt its exclusive to those settings though)
Briefly describe the issue you're experiencing:
In the voxel editor for the player character, if you set a footstep sound, the foot step rate option appears.
If you delete the sound, or move the sound out of the working folder, the foot step sound option will say (none) but the foot step rate option will still be visible. (editor issue)
As a result of the above issue, when using custom equipment setup, items can no longer be equipped by dragging and dropping onto custom widget slots, and equip_item script function will return the following ingame console error:

(gameplay issue)
Are there any errors in the in-game debug console or external console window?
The error shown above in the ingame console.
This error was in the terminal window too:

That one makes sense though as I deleted the sound.....to deliberately cause this bug.
Provide the steps necessary to reproduce the issue:
- Set up custom equipment (slots, widget, item to equip)
- make sure the player character is set to use them
- set a foot step sound on the player
- save player
- delete the sound assigned to footstep
- reopen model to see foot step rate still set to 4, but sound now (none)
- add give-item, and equip_item to startup to try and equip to the custom setup
Solution is to either set a sound and use a footstep sound......,
or:
- make a sound effect
- set the footstep sound to it
- set the step sound manually to none
- now the rate setting goes...and it will work again.
Provide a download link to the bare bones project (strongly recommended if it's an in-game issue, since this helps significantly when attempting to reproduce it; the report will also be given more priority in this case):
Here's a project (with Stumpy to help out 😄 ) already set to error with a missing foot step sound, with rate still visible on the model.
Just play the game to see the error.