Getting this error with no addons other than Zygor installed

[kyrek]

Randomly I get the following error:

Message: ...nfig-3.0\AceConfigDialog-3.0\AceConfigDialog-3.0.lua:1916: bad argument #1 to 'format' (string expected, got nil)
Time: 08/27/17 04:33:05
Count: 4
Stack: ...nfig-3.0\AceConfigDialog-3.0\AceConfigDialog-3.0.lua:1916: bad argument #1 to 'format' (string expected, got nil)Interface\SharedXML\SharedBasicControls.lua:20 4: in function <Interface\SharedXML\SharedBasicControls.lua:203 >
[C]: ?
[C]: in function `format'
...nfig-3.0\AceConfigDialog-3.0\AceConfigDialog-3.0.lua:1916: in function `Open'
Interface\AddOns\ZygorGuidesViewer\Options.lua:349 5: in function `RefreshOptions'
Interface\AddOns\ZygorGuidesViewer\Item-Events.lua:56: in function `OnEvent'
Interface\AddOns\ZygorGuidesViewer\Item-Events.lua:155: in function <Interface\AddOns\ZygorGuidesViewer\Item-Events.lua:155>

Locals: errorMessage = "...nfig-3.0\AceConfigDialog-3.0\AceConfigDialog-3.0.lua:1916: bad argument #1 to 'format' (string expected, got nil)"
DisplayMessageInternal = <function> defined @Interface\SharedXML\SharedBasicControls.lua:187
MESSAGE_TYPE_ERROR = 0

I have done the clean reinstall of Zygor (delete addon folder and variables and reinstall). Please advise.

[ZG Support 1]

Short answer, it's not really a bug to worry about so you can safely ignore it. A longer answer is posted by someone here: http://zygorguides.com/forum/showthr...l=1#post118971