Error: Unknown module(s): 'MGS_Fbuilder'

Error: getting an error when running the command

Command: php bin/magento module:enable MGS_Fbuilder

Error: Unknown module(s): 'MGS_Fbuilder'

version is 2.4

Solution: 

First of all, please try to check your theme package, and make sure you upload the theme files properly. 

And please follow our document: 

https://themes.magesolution.com/gemmart/doc/#install-theme

But just one thing, you need to note, you have to upload 2 folders:

to your server before applying any patchs for magento version you are using.