Da ich nicht so technisch versiert bin, um das Problem zu lösen, wollte ich mich hier erkundigen, ob das lösbar ist.Unfortunately this is caused by your template's scripts which are removing jQuery from the page (and thus creating a jQuery error when it's called). This is the offending line:
<script>jQuery.noConflict(true);</script>
By specifying the "true" parameter, according to the jQuery documentation:
api.jquery.com/jquery.noConflict/
A Boolean indicating whether to remove all jQuery variables from the global scope (including jQuery itself).
This is bad practice and it's a bug that should be fixed by them. Please contact your template provider on assistance on how to fix this. I'm not familiar with Astroid Framework but looking at the source code from github.com/templaza/astroid-framework the line is coming from:
/libraries/astroid/framework/library/astroid/Component/Includer.php
And this is the line that in my opinion needs to be removed:
$content .= '<script>jQuery.noConflict(true);</script>';
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