# Preview Error in RW 8.1.5 and 8.1.6
**URL:** https://forums.realmacsoftware.com/t/preview-error-in-rw-8-1-5-and-8-1-6/25489
**Category:** RapidWeaver Classic
**Created:** [February 28, 2019, 4:56pm UTC](https://forums.realmacsoftware.com/t/preview-error-in-rw-8-1-5-and-8-1-6/25489 "2019-02-28T16:56:53Z")
**Posts on this page:** 12
**Page:** 1
### Author:  [@grbosan](https://forums.realmacsoftware.com/u/grbosan)
#### Post date: [February 28, 2019, 4:56pm UTC](https://forums.realmacsoftware.com/t/preview-error-in-rw-8-1-5-and-8-1-6/25489/1 "2019-02-28T16:56:54Z")
Since upgrading to 8.1.5, I have been receiving an error message when previewing Stacks pages. This error message is not the same as error messages I have seen documented created using the ThemeFlood Blank theme and GoCMS.
The error I received is as follows:
**Fatal error** : require\_once(): Failed opening required ‘/private/var/folders/9p/c9h83wl08xj\_\_r0059b3v95r0000gn/T/com.realmacsoftware.rapidweaver8/RapidWeaver/43280/document-0x7f8374f933a0/RWDocumentPagePreview/rw\_common/plugins/stacks/cmsgo/lib/cmsgo.class.php’ (include\_path=’.:’) in **/private/var/folders/9p/c9h83wl08xj\_\_r0059b3v95r0000gn/T/com.realmacsoftware.rapidweaver8/RapidWeaver/43280/document-0x7f8374f933a0/RWDocumentPagePreview/index.php** on line **58**
Usually when this occurs, I save my document, quit, and restart Rapidweaver. This clears the issue temporarily, but the error continually reoccurs. Is this a bug or am I doing something wrong?
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### Author:  [@wirrah](https://forums.realmacsoftware.com/u/wirrah)
#### Post date: [February 28, 2019, 6:48pm UTC](https://forums.realmacsoftware.com/t/preview-error-in-rw-8-1-5-and-8-1-6/25489/2 "2019-02-28T18:48:31Z")
This has been happening to my projects since 8.1 (ish). I have a stack of my own that has a php “require\_once”. Every so often I get the above error where RW appears to be losing track of things. Simply closing and re-opening the project resolves it.
It happens so inconsistently and only every so often, in my case, I haven’t been overly concerned. But definitely a Version 8 feature and you are not doing something wrong.
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### Author:  [@grbosan](https://forums.realmacsoftware.com/u/grbosan)
#### Post date: [March 1, 2019, 3:42pm UTC](https://forums.realmacsoftware.com/t/preview-error-in-rw-8-1-5-and-8-1-6/25489/3 "2019-03-01T15:42:58Z")
Thanks for the info. I guess I’ll deal with it until a fix is in…
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### Author:  [@wirrah](https://forums.realmacsoftware.com/u/wirrah)
#### Post date: [March 1, 2019, 9:03pm UTC](https://forums.realmacsoftware.com/t/preview-error-in-rw-8-1-5-and-8-1-6/25489/4 "2019-03-01T21:03:44Z")
Just in case it hasn’t been raised before - @tpbradley for your interest.
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### Author:  [@isaiah](https://forums.realmacsoftware.com/u/isaiah)
#### Post date: [March 1, 2019, 11:41pm UTC](https://forums.realmacsoftware.com/t/preview-error-in-rw-8-1-5-and-8-1-6/25489/5 "2019-03-01T23:41:09Z")
if @dan or @tpbradley need anything from me to help them fix this one, just let me know
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### Author:  [@drc007](https://forums.realmacsoftware.com/u/drc007)
#### Post date: [March 29, 2019, 8:39am UTC](https://forums.realmacsoftware.com/t/preview-error-in-rw-8-1-5-and-8-1-6/25489/6 "2019-03-29T08:39:08Z")
I’m testing the demo version of Rapidweaver 8 and I get a similar message for every page on my imported site.
**Fatal error** : require\_once(): Failed opening required ‘/private/var/folders/\_f/l8dgpgtx607\_r4g96937ts7r0000gn/T/com.realmacsoftware.rapidweaver8/RapidWeaver/14676/document-0x7fd045c18520/RWDocumentPagePreview/ads.php’ (include\_path=’.:’) in **/private/var/folders/\_f/l8dgpgtx607\_r4g96937ts7r0000gn/T/com.realmacsoftware.rapidweaver8/RapidWeaver/14676/document-0x7fd045c18520/RWDocumentPagePreview/reviews/fortran/fortran.php** on line **42**
I’ve updated all addons, tried resaving etc. but to no avail.
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### Author:  [@instacks](https://forums.realmacsoftware.com/u/instacks)
#### Post date: [March 29, 2019, 8:50am UTC](https://forums.realmacsoftware.com/t/preview-error-in-rw-8-1-5-and-8-1-6/25489/7 "2019-03-29T08:50:58Z")
Is this a Stacks page? Which stacks are on that page requiring PHP?
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### Author:  [@drc007](https://forums.realmacsoftware.com/u/drc007)
#### Post date: [March 29, 2019, 8:58am UTC](https://forums.realmacsoftware.com/t/preview-error-in-rw-8-1-5-and-8-1-6/25489/8 "2019-03-29T08:58:10Z")
That particular page is plain HTML (actually written in Markdown).
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### Author:  [@instacks](https://forums.realmacsoftware.com/u/instacks)
#### Post date: [March 29, 2019, 9:21am UTC](https://forums.realmacsoftware.com/t/preview-error-in-rw-8-1-5-and-8-1-6/25489/9 "2019-03-29T09:21:48Z")
Well, you have a php error on that page…
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### Author:  [@wirrah](https://forums.realmacsoftware.com/u/wirrah)
#### Post date: [April 5, 2019, 10:42pm UTC](https://forums.realmacsoftware.com/t/preview-error-in-rw-8-1-5-and-8-1-6/25489/10 "2019-04-05T22:42:57Z")
Since installing 8.1.7 I have not seen this issue again. But keeping an eye on it…
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### Author:  [@wirrah](https://forums.realmacsoftware.com/u/wirrah)
#### Post date: [April 22, 2019, 12:10am UTC](https://forums.realmacsoftware.com/t/preview-error-in-rw-8-1-5-and-8-1-6/25489/11 "2019-04-22T00:10:31Z")
Alas no… It happened again 8.1.7, Stacks 3.6.6, OS 10.13.6
Save project and re-open and all good again. Seems to lose track of where the include path is in the preview structure.
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### Author:  [@system](https://forums.realmacsoftware.com/u/system)
#### Post date: [May 22, 2019, 10:10am UTC](https://forums.realmacsoftware.com/t/preview-error-in-rw-8-1-5-and-8-1-6/25489/12 "2019-05-22T10:10:39Z")
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