Local xampp installation and frontend execution trouble

Hello,
Well, first of all well done for your job and this template. This is a must.
I have installed a local server with xampp, apache, mysql and so son. Everything is working fine.
The installation template worked like a charm.Fast and easy without any kind of trouble.
I can create a new page or a post and there no problem but when I try to see the frontend of the website I can the the follwing error message:
I will apreciate a lot any sugestion from you.
Thank you, regards.
Eric

Fatal error: Uncaught Error: Attempt to modify property “extra” on null in C:\xampp\htdocs\imbvista\wp-content\themes\enfold\config-templatebuilder\avia-template-builder\php\asset-manager.class.php:897 Stack trace: #0 C:\xampp\htdocs\imbvista\wp-content\themes\enfold\config-templatebuilder\avia-template-builder\php\asset-manager.class.php(289): aviaAssetManager->try_deregister_scripts(‘avia-head-scrip…’) #1 C:\xampp\htdocs\imbvista\wp-content\themes\enfold\config-templatebuilder\avia-template-builder\php\asset-manager.class.php(104): aviaAssetManager->merge(‘js’, ‘avia-head-scrip…’, Array) #2 C:\xampp\htdocs\imbvista\wp-includes\class-wp-hook.php(292): aviaAssetManager->try_minifying_scripts(”) #3 C:\xampp\htdocs\imbvista\wp-includes\class-wp-hook.php(316): WP_Hook->apply_filters(NULL, Array) #4 C:\xampp\htdocs\imbvista\wp-includes\plugin.php(484): WP_Hook->do_action(Array) #5 C:\xampp\htdocs\imbvista\wp-includes\script-loader.php(2027): do_action(‘wp_enqueue_scri…’) #6 C:\xampp\htdocs\imbvista\wp-includes\class-wp-hook.php(292): wp_enqueue_scripts(”) #7 C:\xampp\htdocs\imbvista\wp-includes\class-wp-hook.php(316): WP_Hook->apply_filters(NULL, Array) #8 C:\xampp\htdocs\imbvista\wp-includes\plugin.php(484): WP_Hook->do_action(Array) #9 C:\xampp\htdocs\imbvista\wp-includes\general-template.php(3009): do_action(‘wp_head’) #10 C:\xampp\htdocs\imbvista\wp-content\themes\enfold\header.php(100): wp_head() #11 C:\xampp\htdocs\imbvista\wp-includes\template.php(730): require_once(‘C:\\xampp\\htdocs…’) #12 C:\xampp\htdocs\imbvista\wp-includes\template.php(676): load_template(‘C:\\xampp\\htdocs…’, true, Array) #13 C:\xampp\htdocs\imbvista\wp-includes\general-template.php(48): locate_template(Array, true, true, Array) #14 C:\xampp\htdocs\imbvista\wp-content\themes\enfold\template-builder.php(15): get_header() #15 C:\xampp\htdocs\imbvista\wp-includes\template-loader.php(106): include(‘C:\\xampp\\htdocs…’) #16 C:\xampp\htdocs\imbvista\wp-blog-header.php(19): require_once(‘C:\\xampp\\htdocs…’) #17 C:\xampp\htdocs\imbvista\index.php(17): require(‘C:\\xampp\\htdocs…’) #18 {main} thrown in C:\xampp\htdocs\imbvista\wp-content\themes\enfold\config-templatebuilder\avia-template-builder\php\asset-manager.class.php on line 897