I found what is happening and I would like to have help to fix it
This is related to the fact that I am using another template administrator different from the Joomla default one. It will be helpful to anyone doing the same.
The template I am using is Xiroadmin Administrator Template
Looks like SP Page builder is having issue with it.
Here is the issue
..../libraries/src/WebAsset/WebAssetRegistry.php:135
{
// Check if any new file was added
$this->parseRegistryFiles();
if (empty($this->assets[$type][$name])) {
throw new UnknownAssetException(sprintf('There is no "%s" asset of a "%s" type in the registry.', $name, $type));
}
return $this->assets[$type][$name];
}
Thanks for providing the fix