while installing plugin it shows Component group with this name is already installed error

[User12345678]

I install new plugin.While installing it shows some common error . I fixed them, then again Installing it shows "Component group with this name is already installed " error. I deleted plugin related file which is located into plugin and etc folder. But it shows same error,

How to fix that error?

 

Edited April 5, 2017 by Mohanapriya
To correct spelling

[andrewatfornax]

Hi @Mohanapriya,

You may need to completely uninstall the plugin, from the UI, so that it removes the files as well as the database entries, before trying to re-install.