The error message says it all. You already have gantry installed on the site. I guess you have already used a Gantry template at some point so Gantry is already loaded.
Hope this helps
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as Wordpress don’t show the process of install so simply i double click the install button again while it was on process.. so in this action I’ve duplicate the file which cause this error...
to solve this problem:(just for record for those whom might have the same problem in future)
even u go to plugin and u will found it their and just activate it.. ..if you did not find it in plugin you have to go to FTP (web-content >plugins) and delete it and reinstall again and it should work fine..
Thanks for the confirmation. WordPress is not quite as user friendly in some things as it is in others.
Glad you found a solution and thanks for posting it back as it may help others
Please search forums before posting. Please make sure your post includes the version of the CMS you are using and a link to the problem. Annotations on screenshots can also be helpful to explain problems/goals. Please use the "secure" tab for confidential information