An unknown error occurred when trying to access End device

Hi, I have two End devices that cannot be deleded. I get the message “An unknown error occurred” when i try to access the End device.
please help…

Welcome, however, TTN Forumites & Mods are not mind readers…details/info please!!!

sure :slight_smile: I log on to to the console ( Overview - Console - The Things Network, and created an application. next I try to create an “end device”. Something went wrong, I thing I fill out some garbage, and later when I click on the the “end device”, I got a new screen with this error:

An unknown error occurred

If the error persists after refreshing, please contact an administrator

How do i contact an administrator?