“The page is currently unable to handle this request.” HTTP ERROR 500

Whenever i try to save anything using the plugin, being a change of the design, or turning status to on, i get this :

This page isn’t working

https://www.prismarenders.com.br is currently unable to handle this request.
HTTP ERROR 500

Nothing on this plugin is working for me..

Info :

WordPress
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Home Url: https://www.prismarenders.com.br
Site Url: https://www.prismarenders.com.br
Version: 4.8.1
Debug Mode: No
Locale: pt_BR
Multisite: No
Page For Posts: Not Set
Page On Front: Home (#30)
Permalink Structure: /%category%/%postname%
Show On Front: page
Wp Cron: No

Settings
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Version: 3.12.1
Db Version: 3.12.1
Course Catalog: Cursos (#43)
Course Catalog Per Page: 10
Course Catalog Sorting: menu_order,ASC
Membership Catalog: Not Set
Membership Catalog Per Page: 10
Membership Catalog Sorting: menu_order,ASC
Site Membership: Not Set
Student Dashboard: Aluno (#112)
Courses Endpoint: Meus cursos
Edit Endpoint: Editar conta
Lost Password Endpoint: Perdi minha senha
Vouchers Endpoint: Voucher
Autogenerate Username: yes
Password Strength Meter: no
Minimum Password Strength: weak
Terms Required: no
Terms Page: Not Set
Checkout Names: required
Checkout Address: hidden
Checkout Phone: hidden
Checkout Email Confirmation: yes
Open Registration: yes
Registration Names: required
Registration Address: hidden
Registration Phone: hidden
Registration Voucher: optional
Registration Email Confirmation: yes
Account Names: required
Account Address: hidden
Account Phone: hidden
Account Email Confirmation: yes
Checkout Page: Compra (#110)
Confirmation Endpoint: confirmar pagamento
Force Ssl Checkout: yes
Country: BR
Currency: BRL
Currency Position: left_space
Thousand Separator: .
Decimal Separator: ,
Decimals: 2
Trim Zero Decimals: no
Recurring Payments: yes
Email From Address: [email protected]
Email From Name: Prisma Renders
Email Footer Text:
Email Header Image:
Cert Bg Width: 800
Cert Bg Height: 616
Cert Legacy Compat: no

Gateways
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PayPal: Enabled
PayPal Test Mode: Disabled
PayPal Logging: no
PayPal Order: 1
Manual: Enabled
Manual Logging: no
Manual Order: 1

Server
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Mysql Version: 5.5.51
Php Curl: Yes
Php Default Timezone: UTC
Php Fsockopen: Yes
Php Max Input Vars: 1000
Php Max Upload Size: 64 MB
Php Memory Limit: 256M
Php Post Max Size: 64M
Php Soap: Yes
Php Suhosin: No
Php Time Limt: 30
Php Version: 5.6.30
Software: Apache
Wp Memory Limit: 40M

Theme
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Name: Customizr
Version: 4.0.7
Themeuri: https://presscustomizr.com/customizr
Authoruri: https://presscustomizr.com/
Template:
Child Theme: No
Llms Support: No

Plugins
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Advanced CSS Editor: 3.0
Beaver Builder Plugin (Lite Version): 1.10.7
BuddyPress: 2.9.1
Child Theme Configurator: 2.2.8.1
Cimy User Manager: 1.5.0
Contact Form 7: 4.9
Custom Sidebars: 3.0.9
Google Analytics for WordPress by MonsterInsights: 6.2.2
LifterLMS: 3.12.1
LifterLMS Customizations: 1.0.0
LifterLMS Helper: 2.5.0
LifterLMS Labs: 1.3.1
LifterLMS PayPal Gateway: 1.0.2
Loco Translate: 2.0.15
LoginPress – Customizing the WordPress Login: 1.0.21
Nav Menu Roles: 1.8.6
Photo Gallery by Supsystic: 1.10.7
PixelYourSite: 5.0.7
Recent Posts Widget With Thumbnails: 5.1
Search Exclude: 1.2.2
Toggle The Title: 1.4
Under Construction: 2.50
WooCommerce: 3.1.2
WooCommerce PagSeguro: 2.12.5
WooCommerce PayPal Express Checkout Gateway: 1.4.3
WooCommerce URL Coupons: 2.5.1
Woo PagSeguro Parceled: 1.6.0
Wordfence Security: 6.3.18
WP Change Default Email: 0.4
WP Force SSL: 1.3
WPGlobus: 1.8.6
WP Super Cache: 1.5.5
Yoast SEO: 5.3.3

Integrations
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BbPress: No
BuddyPress: No

Template Overrides
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The page I need help with: [log in to see the link]