[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3929: Error reading directory: 'coroutine' object has no attribute 'addCallback'

[Tahoe-LAFS]

#3929: Error reading directory:  'coroutine' object has no attribute 'addCallback'
-------------------------------+---------------------------
 Reporter:  meejah             |          Owner:
     Type:  defect             |         Status:  new
 Priority:  major              |      Milestone:  undecided
Component:  code-frontend-web  |        Version:  unknown
 Keywords:                     |  Launchpad Bug:
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 On a very recent revision (`d2dd21142`) I see an error why opening a read-
 only directory cap (in the WebUI):

 `Error reading directory:  'coroutine' object has no attribute
 'addCallback'`

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3929>
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