Earthkin Defender Defensive Stance no longer activating

[Xaevarin]

Description of Bug Experienced:
When activating Defensive Stance for the Earthkin Defender, the ability does not turn on. The information box provides this error information:

Script ar_chat, OID: ffffff4a, Tag: , ERROR: TOO MANY INSTRUCTIONS

Script evt_ft_bef, OID ffffff4a, Tag: , ERROR: TOO MANY INSTRUCTIONS

In addition to this, instead of activating the ability the character will take on the ability casting animation instead and in the action queue in the top left corner, the symbol for barbarian rage will appear instead.

Steps to reproduce the Bug:
Clicking on the Defensive Stance ability.

Expected Result:
The ability activating.

Actual Result:
Error messages appearing in the information box. Character engaging in a casting animation instead of activating the Defensive Stance.

Screenshot(s)

Additional Information/Notes