1. Make sure the bot is online. Discord may be having problems, or they bot may need to be restarted.(for more information you can check our Discord)
2. Make sure you are using the right prefix. The default prefix is set to !
3. If none of the above work feel free to join our Discord and ask for help.
The bot can only assign roles that are below it, double check where the bot role is on the list and where the role you are assigning is.
This something to do with echo's code. and you shod contact the support team.
This has nothing to do with echo, but try the command again or restart discord. Contact echo support if it happens non-stop and you can not get it to stop.