Apt repository not signed?

[jean-gui]

When I try to use this module, I get the following apt error:

W: GPG error: http://apt.puppetexplorer.io stable Release: The following signatures were invalid: CA37C758D0D8CD3AE9740C466F75C6183FF5E93D
W: The repository 'http://apt.puppetexplorer.io stable Release' is not signed.

Is something wrong with the repository?

[jjuarez]

I faced the same issue after some of changes related with the compatibility of the module version 1.1.1 and the puppetlabs-apt