Error after importing the starter template

?Hello, I’ve tried to import kadence starter templates into my WordPress website. But the problem is while importing the templates its shows like import is complete! and down that error: Error (503) Like this. I’ve tried to install the starter template by deactivating all the plugins,
Also, I’ve added the below code to .htaccess file,
<IfModule litespeed>
RewriteEngine On
RewriteRule .* – [E=noabort:1, E=noconntimeout:1]
</IfModule>
And also modified the php.ini files ‘max_execution_time’ has been set to ‘300’ ‘max_input_time’ has been set to ‘600’ ‘max_input_vars’ has been set to ‘1000’ ‘memory_limit’ has been set to ‘1024M’ ‘post_max_size’ has been set to ‘128M’ ‘upload_max_filesize’ has been set to ‘1G’
Then I activated the debug info on WordPress website and here is what I got on debug log. ( WordPress-Debug-Log )

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[19-Aug-2021 10:29:36 UTC] WordPress database error Table ‘rivixpro_wp869.wp3u_fluentform_submissions’ doesn’t exist for query SELECT wp3u_fluentform_forms.title, wp3u_fluentform_submissions.form_id, count(wp3u_fluentform_submissions.id) as total, max(wp3u_fluentform_submissions.id) as max_id FROM wp3u_fluentform_submissions INNER JOIN wp3u_fluentform_forms ON wp3u_fluentform_forms.id = wp3u_fluentform_submissions.form_id GROUP BY wp3u_fluentform_submissions.form_id ORDER BY max_id DESC LIMIT 10 made by wp_dashboard, do_meta_boxes, FluentForm\Framework\Foundation\Application->{closure}, FluentForm\App\Modules\DashboardWidgetModule->showStat, WpFluent\QueryBuilder\QueryBuilderHandler->get
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Then I’ve tried to do the same on different WordPress websites that are hosted on different platforms. But still the problem is the same.
I would like to try the pro version of kadence but I’m not sure whether it works. Please help me to reslove this?