# Error App\\\\Application when upgrading version of CakePHP from 3.6 to 3.7

**URL:** <https://discourse.cakephp.org/t/error-app-application-when-upgrading-version-of-cakephp-from-3-6-to-3-7/6031>\
**Category:** Need Help\
**Created:** [May 2, 2019, 8:21am UTC](https://discourse.cakephp.org/t/error-app-application-when-upgrading-version-of-cakephp-from-3-6-to-3-7/6031 "2019-05-02T08:21:57Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![VLDCNDN](https://avatars.discourse-cdn.com/v4/letter/v/c89c15/32.png) [@VLDCNDN](https://discourse.cakephp.org/u/VLDCNDN)\
**Post date:** [May 2, 2019, 8:21am UTC](https://discourse.cakephp.org/t/error-app-application-when-upgrading-version-of-cakephp-from-3-6-to-3-7/6031/1 "2019-05-02T08:21:57Z")

</div>

My application is working if the version of my cake 3.6.7 then after upgrading it to version 3.7.\* it causes an error when running my application it just show error 500.

here’s the error at apache:

> PHP Fatal error: Uncaught Error: Class ‘App\Application’ not found in /var/www/html/test/webroot/index.php:37\nStack trace:\n#0 {main}\n thro