[Resolved] Add Many to Many Relationship

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[nestorC-2]

I am trying to:

Add a many fo many relationship from supplier CPT to any other post, I get this frontend hidden link and the following in backend

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WordPress version 5.6.1
Current theme: Astra (version 3.0.2)
Current plugin: Toolset Forms (version 2.6.6)
PHP version 7.4.14

Error Details
=============
An error of type E_ERROR was caused in line 345 of the file /www/homemploy_938/public/wp-content/plugins/cred-frontend-editor/vendor/toolset/toolset-common/inc/autoloaded/post_type/from_types.php. Error message: Uncaught InvalidArgumentException in /www/homemploy_938/public/wp-content/plugins/cred-frontend-editor/vendor/toolset/toolset-common/inc/autoloaded/post_type/from_types.php:345
Stack trace:
#0 /www/homemploy_938/public/wp-content/plugins/cred-frontend-editor/vendor/toolset/toolset-common/inc/autoloaded/post_type/repository.php(131): Toolset_Post_Type_From_Types->set_registered_post_type(Object(Toolset_Post_Type_Registered))
#1 /www/homemploy_938/public/wp-includes/class-wp-hook.php(287): Toolset_Post_Type_Repository->finish_loading_registered_post_types('')
#2 /www/homemploy_938/public/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters(NULL, Array)
#3 /www/homemploy_938/public/wp-includes/plugin.php(484): WP_Hook->do_action(Array)
#4 /www/homemploy_938/public/wp-settings.php(557): do_action('init')
#5 /www/homemploy_938/public/wp-config.php(79): require_once('/www/homemploy_...')
#6 /www/homemploy_938/public/wp-load.php(37): require_once('/www/homemploy_...')
#7 /www/homemploy_938/public/wp-admin/admi

[nestorC-2]

It seems that is on every Many to Many because I tried to add Goals to Certifications Many to Many and the same issue

[nestorC-2]

I guess that it's because I add used a number on slug ("15" instead of supplier-certification) because keeping on default I don't get issues

I will open if needed again