- Plesk Onyx for Linux
- Plesk Onyx for Windows
While trying to upload a plugin at Plesk > Wordpress > Sets > Wordpress Essentials > Add Plugin > Upload Plugin, the following error appears:
PLESK_ERROR: Error: The underscore character is not allowed in the plugin file name.
This is a Plesk Extension bug with ID EXTWPTOOLK-1052.
As a workaround install plugin at Plesk > Domains > example.com > My CMS > Log in to Admin Dashboard > Plugins
Go at Add New > Upload Plugin
Then choose plugin zip file > click Install Now > Activate Plugin