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1.  Check to see if you are using the latest version of the addon.  If there is a newer alpha/beta/release version, see if your problem exists with the new version.

2.  Check to see if someone else has already opened an issue report here.  Please don't submit repeat reports.

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WHEN SUBMITTING AN ISSUE:

Please provide the following information.  Leaving it out may result in your ticket being ignored (because I won't have the information needed to explore your report).

1.  The information from the Issue Reporting tab ( /hekili > Issue Reporting ).  This provides your talent and gear information.  You can paste it to pastebin.com and provide a link here.

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2.  If reporting a disagreement with the addon's recommendations, please take a snapshot when you observe the issue and provide the snapshot.  This is not a screenshot.  A snapshot can be generated by binding the Pause feature on the Toggles tab.  When you press Pause, a snapshot of how the addon decided on its CURRENT recommendations is generated and saved to the Snapshots tab.  Copy and paste this to pastebin.com and provide the link here.
 
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3.  If reporting an error (i.e., the addon freezes and/or disables itself), please install the BugSack and BugGrabber addons as they will enable you to paste the exact error message, with detail that will help me identify where the code error is located.  You can paste the error information here or use pastebin.com for that as well.

The rotation bar is not appearing for Discipline. When looking under Priority there is no option to select for the priority list.

build: v8.3.0-04-19
level: 90 (90)
class: PRIEST
spec: discipline

talents: body_and_soul
castigation
divine_star
power_word_solace
psychic_voice
sins_of_the_many

azerite: none

essences: none*, none

sets/legendaries/artifacts: none

gear: amaranthine_cord = 1
amaranthine_cowl = 1
amaranthine_sandals = 1
amaranthine_wristwraps = 1
cloak_of_hidden_flasks = 1
empty_fruit_barrel = 1
guardian_serpent_handwraps = 1
hollowheart_pantaloons = 1
iron_horde_ritual_staff = 1
legacy_of_the_emperor = 1
links_of_the_lucid = 1
price_of_progress = 1
regal_silk_shoulderpads = 1
tabard_of_flame = 1
viscous_ring = 1
wicked_witchs_signet = 1

corruptions: none

itemIDs: 101801, 101802, 101807, 101810, 112392, 112434, 23705, 81133, 81136, 81232, 81257, 81266, 85363, 86312, 88166, 89067

settings: enabled = true
potionsReset = 20180919.1

toggles: cooldowns = false
custom1 = false
custom2 = false
defensives = false
essences = true
interrupts = false
mode = automatic
potions = false

Thanks!

Yeah, Discipline is not officially supported.