The customer is fully up to date on PBXact 16 and was getting the module signing error. The error gives a link to a broken link that only works if you are logged in with a @sangoma.com account to the wiki. The link redirects to the proper page if you are logged in from a @sangoma.com account, but for a standard user the link just says you need to log in.
To fix this, the link in the error message should be changed to the correct link which is https://wiki.freepbx.org/display/FPG/Module+Signing rather than the current broken link whihc is https://wiki.freepbx.org/pages/viewpage.action?spaceKey=F2&title=Module+Signing .
In summary - Please update the module signaling error to point to https://wiki.freepbx.org/display/FPG/Module+Signing .
Let me know if more info is needed, but this happened on PBXact 16