[FS#413] ubus_invoke_async: symbol not found

[LEDE Bugs]

The following task has a new comment added:

FS#413 - ubus_invoke_async: symbol not found
User who did this - howl (howl)

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With the actual snapshot r3064 the bug still appears. Could be a problem with buildbot?
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=413#comment1359