I don’t know which icon you are using. In case you are using services medium like in this demo https://codeless.co/specular/business2/ the CSS code to be added in the Specular > General > Custom Css Box:
.services_medium.style_3:hover .icon_wrapper i {
color: #fff !important;
}
In the color instruction, you can add the color you wish.
Anyway to give you the exact instruction I have to check out your online link.
Did you have installed the latest version of the theme?
The quick solution is to edit the page where you see the error and in the Slider Options set the Layer Slider as slider and set the slide you had created.
Permanent fix is by editing the file: wp-content/themes/specular/includes/core/codeless_slideshow.php edit line 60 :
I can’t access the file after tried again so you can make this change by yourself. Please edit the file wp-content/themes/picante/includes/codeless_functions_backend_editor.php search for the line above
I haven’t disabled it. You have only to go into in the dashboard edit the page and click on the Classic Editor button there you can add any css or js you want.
Or for Custom Css you can add it on Specular > General > Custom Css
