# Preview Problem (Error)

**URL:** <https://forums.realmacsoftware.com/t/preview-problem-error/24962>\
**Category:** RapidWeaver Classic\
**Created:** [January 31, 2019, 4:07pm UTC](https://forums.realmacsoftware.com/t/preview-problem-error/24962 "2019-01-31T16:07:18Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![omniaaron](https://dub1.discourse-cdn.com/flex005/user_avatar/forums.realmacsoftware.com/omniaaron/32/6586_2.png) [@omniaaron](https://forums.realmacsoftware.com/u/omniaaron)\
**Post date:** [January 31, 2019, 4:07pm UTC](https://forums.realmacsoftware.com/t/preview-problem-error/24962/1 "2019-01-31T16:07:18Z")

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When trying to preview a page, which had been converted to RW8, I get the following NEW (I used to be able to preview) error message: “NSUnknownKeyException: [\<MyDocument 0x7f89db33d850\> valueForUndefinedKey:]: this class is not key value coding-compliant for the key \_exporter.”

Any clues?  
Thanks!  
-Aaron

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**Author:** ![NeilUK](https://dub1.discourse-cdn.com/flex005/user_avatar/forums.realmacsoftware.com/neiluk/32/23434_2.png) [@NeilUK](https://forums.realmacsoftware.com/u/NeilUK)\
**Post date:** [January 31, 2019, 4:09pm UTC](https://forums.realmacsoftware.com/t/preview-problem-error/24962/2 "2019-01-31T16:09:31Z")

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Maybe this would help?

> [@NSUnknownKeyException](http://forums.realmacsoftware.com/t/nsunknownkeyexception/24920):
>
> I just updated to RW 8.1.2 Since I’m getting the following error message: N@UnknownKeyException My documet 0x7f9297c5dc70 value ForUndefinedKey: this class is not key value coding-compliant for the key\_exporter Any idea what to do???

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**Author:** ![omniaaron](https://dub1.discourse-cdn.com/flex005/user_avatar/forums.realmacsoftware.com/omniaaron/32/6586_2.png) [@omniaaron](https://forums.realmacsoftware.com/u/omniaaron)\
**Post date:** [January 31, 2019, 4:12pm UTC](https://forums.realmacsoftware.com/t/preview-problem-error/24962/3 "2019-01-31T16:12:37Z")

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THAT WAS IT!  
Wow, thank you so much already!

-Aaron

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**Author:** ![isaiah](https://dub1.discourse-cdn.com/flex005/user_avatar/forums.realmacsoftware.com/isaiah/32/93_2.png) [@isaiah](https://forums.realmacsoftware.com/u/isaiah)\
**Post date:** [February 1, 2019, 3:31am UTC](https://forums.realmacsoftware.com/t/preview-problem-error/24962/4 "2019-02-01T03:31:01Z")

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I think the answer here was to update plugins. So I’ll just leave a link here to all those LogHound updates, just in case someone else has the same issues.

> [@LogHound plugins Moved to YourHead](http://forums.realmacsoftware.com/t/loghound-plugins-moved-to-yourhead/24925):
>
> 3 Years ago I took over the maintenance of all of the LogHound plugins. In those three years we’ve updated every one of them, at least a little bit – and sometimes with big improvements too. Unfortunately if you have a LogHound version, it can’t automatically find the new versions we’ve posted. You’ll have to download and replace them manually. It’s not automatic – but don’t worry, it’s not hard either. slight_smile Here is where you can download each one, what their latest version is. And …

Isaiah

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**Author:** ![system](https://dub1.discourse-cdn.com/flex005/user_avatar/forums.realmacsoftware.com/system/32/25301_2.png) [@system](https://forums.realmacsoftware.com/u/system)\
**Post date:** [March 3, 2019, 1:31pm UTC](https://forums.realmacsoftware.com/t/preview-problem-error/24962/5 "2019-03-03T13:31:06Z")

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