Form Work on Local, But Not on Server

The plugin was working marvellously on my local, but the moment I put it on our server the form doesn’t submit.

When I click on the submit button, nothing happen (no loading animation).
I’m getting a 500 error on the console:

/wp-json/contact-form-7/v1/contact-forms/56/feedback Failed to load resource: the server responded with a status of 500 (Internal Server Error)

On the Error log im getting this:

Use ‘LimitInternalRecursion’ to increase the limit if necessary. Use ‘LogLevel debug’ to get a backtrace.

My .htaccess is like this:

# Use PHP5.6 as default
AddHandler application/x-httpd-php56 .php

# BEGIN WordPress
AddHandler application/x-httpd-php70 .php
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /~cqaveamy/public_html/
RewriteCond %{REQUEST_URI} !^/[0-9]+\..+\.cpaneldcv$
RewriteCond %{REQUEST_URI} !^/[A-F0-9]{32}\.txt(?:\ Comodo\ DCV)?$
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} !^/[0-9]+\..+\.cpaneldcv$
RewriteCond %{REQUEST_URI} !^/[A-F0-9]{32}\.txt(?:\ Comodo\ DCV)?$
RewriteRule . /~cqaveamy/public_html/index.php [L]
</IfModule>

# END WordPress

any insight would be greatly appreciated.

Thanks