Flee and Chase Modes Not Working

I feel a bit daft for posting this, but I cannot for the life of me get the flee or chase AI modes to work. When in chase mode, the vehicle activates the parking brake and won't budge. If the vehicle gets moved (i.e. a collision from another vehicle), it will shift rapidly between reverse, neutral, and first gear, but won't move, because the parking brake won't deactivate. As for flee mode, it just resets to 'disabled' as soon as I tab out of the vehicle. Any suggestions as to why this is happening and what I can do to fix this? Thanks.

 

Same issue I was having aswell with the AI.

Never would've thought that would be the fix

Thank you @Nadeox1

 

Works fine now. Thanks!