There is no "template.cassiopeia.ltr" asset of a "preset" type in the registry??

I am getting a HTTP 500 error.  I was disabling modules and removing articles that I would not use when this happened.  I am not sure what caused the issue but if you can make a suggestion I would appreciate so I don't have to start over.

fwmdev.com/cleaningservice/index.php#trace-box-1The Error Says:

Joomla\CMS\WebAsset\Exception\UnknownAssetExceptionin  /home/devfwm/public_html/cleaningservice/libraries/src/WebAsset/WebAssetRegistry.php  (line 134)

1. Code:

       {
2. Code:

           // Check if any new file was added
3. Code:

           $this->parseRegistryFiles();
4.  
5. Code:

           if (empty($this->assets[$type][$name])) {
6. Code:

               throw new UnknownAssetException(sprintf('There is no "%s" asset of a "%s" type in the registry.', $name, $type));
7. Code:

           }
8.  
9. Code:

           return $this->assets[$type][$name];
10. Code:

        }

Hello,

Sorry but I have no idea what could cause that exactly. You probably deleted a file that mustn’t be deleted or somehow damaged the Joomla database. Maybe you deleted the Cassiopeia template?

You will need to restore your website from backup.

Regards,
Milos