# Mautic 2.0 Preview form error log
**URL:** https://forum.mautic.org/t/mautic-2-0-preview-form-error-log/3920
**Category:** Product Support
**Created:** [July 6, 2016, 10:09pm UTC](https://forum.mautic.org/t/mautic-2-0-preview-form-error-log/3920 "2016-07-06T22:09:22Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@eduardo](https://forum.mautic.org/u/eduardo)
#### Post date: [July 6, 2016, 10:09pm UTC](https://forum.mautic.org/t/mautic-2-0-preview-form-error-log/3920/1 "2016-07-06T22:09:22Z")
So I tried to preview a campaing form on the mautic UI which prompted to a new site with this error logs
Does anyone have the same error?
Warning: include(/home/user/mautic/vendor/twig/twig/lib/Twig/Node/Expression/Test/Defined.php): failed to open stream: No such file or directory in /home/user/mautic/vendor/composer/ClassLoader.php on line 412
Warning: include(): Failed opening ‘/home/user/mautic/vendor/twig/twig/lib/Twig/Node/Expression/Test/Defined.php’ for inclusion (include\_path=’.:/usr/lib/php:/usr/local/lib/php’) in /home/padron5/mautic/vendor/composer/ClassLoader.php on line 412
Fatal error: Class ‘Twig\_Node\_Expression\_Test\_Defined’ not found in /home/user/mautic/app/cache/prod/classes.php on line 6705
---
### Author:  [@escopecz](https://forum.mautic.org/u/escopecz)
#### Post date: [July 8, 2016, 10:25am UTC](https://forum.mautic.org/t/mautic-2-0-preview-form-error-log/3920/2 "2016-07-08T10:25:07Z")
This issue was already reported at GitHub. Please, let’s discuss this issue there so it’s all in one place:
[https://github.com/mautic/mautic/issues/1983#issuecomment-231334371](https://github.com/mautic/mautic/issues/1983#issuecomment-231334371)
---
### Author:  [@ikolubr](https://forum.mautic.org/u/ikolubr)
#### Post date: [July 8, 2016, 12:39am UTC](https://forum.mautic.org/t/mautic-2-0-preview-form-error-log/3920/3 "2016-07-08T00:39:15Z")
Almost same issue here.
Before:
```auto
error] 1258#1258: *390 FastCGI sent in stderr: "PHP message: PHP Fatal error: Class 'Twig_Node_Expression_Test_Defined' not found in /var/www/.../htdocs/vendor/twig/twig/lib/Twig/Extension/Core.php on line 298" while reading response header from upstream, client: ..., server: ..., request: "POST /form/submit?formId=2 HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: ...
```
Now:
```auto
[error] 1258#1258: *694 FastCGI sent in stderr: "PHP message: PHP Fatal error: Class 'Twig_Node_Expression_Test_Defined' not found in /var/www/.../htdocs/app/cache/prod/classes.php on line 6705" while reading response header from upstream, client: ..., server: ..., request: "POST /form/submit?formId=2 HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: ...
```
Already tried clearing cache…
---
### Author:  [@eduardo](https://forum.mautic.org/u/eduardo)
#### Post date: [July 6, 2016, 10:09pm UTC](https://forum.mautic.org/t/mautic-2-0-preview-form-error-log/3920/4 "2016-07-06T22:09:22Z")
So I tried to preview a campaing form on the mautic UI which prompted to a new site with this error logs
Does anyone have the same error?
Warning: include(/home/user/mautic/vendor/twig/twig/lib/Twig/Node/Expression/Test/Defined.php): failed to open stream: No such file or directory in /home/user/mautic/vendor/composer/ClassLoader.php on line 412
Warning: include(): Failed opening ‘/home/user/mautic/vendor/twig/twig/lib/Twig/Node/Expression/Test/Defined.php’ for inclusion (include\_path=’.:/usr/lib/php:/usr/local/lib/php’) in /home/padron5/mautic/vendor/composer/ClassLoader.php on line 412
Fatal error: Class ‘Twig\_Node\_Expression\_Test\_Defined’ not found in /home/user/mautic/app/cache/prod/classes.php on line 6705
---
### Author:  [@JustinT](https://forum.mautic.org/u/JustinT)
#### Post date: [July 6, 2016, 10:29pm UTC](https://forum.mautic.org/t/mautic-2-0-preview-form-error-log/3920/5 "2016-07-06T22:29:45Z")
I have been seeing this error on a few other actions as well. I see it when trying to use the landing page builder and when trying to clear my cache. It also appears several times in my apache logs. I was getting this error when using a custom theme but I fixed a couple of syntax issues and the error went away, no idea what is actually causing it though.
_Edit_
I have included the message I get when clearing my cache:
[quote]
PHP Warning: include(): Failed opening ‘/var/www/html/vendor/twig/twig/lib/Twig/Node/Expression/Test/Defined.php’ for inclusion (include\_path=’.:/usr/share/php’) in /var/www/html/vendor/composer/ClassLoader.php on line 412
[SymfonyComponentDebugExceptionClassNotFoundException]
Attempted to load class “Twig\_Node\_Expression\_Test\_Defined” from the global namespace.
Did you forget a “use” statement?[/quote]