# PHP fatal error why installing Acquia’s Custom Objects plugin

**URL:** <https://forum.mautic.org/t/php-fatal-error-why-installing-acquia-s-custom-objects-plugin/31037>\
**Category:** Mautic 5 Install/Upgrade Support\
**Created:** [February 23, 2024, 4:26pm UTC](https://forum.mautic.org/t/php-fatal-error-why-installing-acquia-s-custom-objects-plugin/31037 "2024-02-23T16:26:10Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![kafoalex](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/kafoalex/32/12681_2.png) [@kafoalex](https://forum.mautic.org/u/kafoalex)\
**Post date:** [February 23, 2024, 4:26pm UTC](https://forum.mautic.org/t/php-fatal-error-why-installing-acquia-s-custom-objects-plugin/31037/1 "2024-02-23T16:26:10Z")

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**Your software**  
My Mautic version is: 5.02  
My PHP version is: 8.0.21  
My Database type and version is:MYSQL8

**Your problem**  
My problem is:  
Hello guys i got this error why installing Acquia’s Custom Objects plugin please i need help ([How to install Acquia's Custom Objects plugin?](https://forum.mautic.org/t/how-to-install-acquias-custom-objects-plugin/24204))

error: PHP Fatal error: Uncaught Error: Undefined constant Mautic\LeadBundle\LeadEvents::LIST\_FILTERS\_MERGE in /var/www/html/mautic/plugins/CustomObjectsBundle/EventListener/SegmentFiltersMergeSubscriber.php:27 Stack trace:  
These errors are showing in the log:

Steps I have tried to fix the problem: I deleted my cash but it’s still showing thesmae error

 ![Error](https://us1.discourse-cdn.com/flex020/uploads/mautic/original/2X/9/983423f115de8577751ede5d46e0024bd4560daf.png)

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**Author:** ![peceunicis](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/peceunicis/32/13330_2.png) [@peceunicis](https://forum.mautic.org/u/peceunicis)\
**Post date:** [March 31, 2024, 8:54pm UTC](https://forum.mautic.org/t/php-fatal-error-why-installing-acquia-s-custom-objects-plugin/31037/2 "2024-03-31T20:54:28Z")

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Hi, did you solve the issue. I’m also trying to install in on M5, and tired almost all the [branches](https://github.com/acquia/mc-cs-plugin-custom-objects), still nothing?

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**Author:** ![ncmon](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/ncmon/32/11887_2.png) [@ncmon](https://forum.mautic.org/u/ncmon)\
**Post date:** [May 11, 2024, 2:05pm UTC](https://forum.mautic.org/t/php-fatal-error-why-installing-acquia-s-custom-objects-plugin/31037/4 "2024-05-11T14:05:23Z")

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no luck here too.  
and now i have my mautic down…

i guess that nobody is using it on M5. also the same with twitter plugin on M5.  
considering going back to M4…