AddCustomControl not present in the content

[AmemiyaLai]

Already referred to GHCustomControls.dll, when I use AddCustomControl the bus always shows does not exist in the content, can anyone tell me why, thanks
file：https://drive.google.com/file/d/1-eHZai-dXboAF1P5leTOhQEmuS3XqDUj/view?usp=share_link

[Torabi]

you need to inherit from GHCustomComponent