Package repostory has no Release file

[Hypexed]

Added the key and repository to my sources fine. But apt-get updating yields this error. Relevant sections quoted.

Ign:3 http://dl.bintray.com/sba1/adtools-deb bionic InRelease Err:9 http://dl.bintray.com/sba1/adtools-deb bionic Release 404 Not Found [IP: 52.26.64.218 80] Reading package lists... Done E: The repository 'http://dl.bintray.com/sba1/adtools-deb bionic Release' does not have a Release file. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details.