Cannot sign iOS app after refreshing iOS Certificate

Hi,

I had to redo my iOS distribution certificate. After I did this and building my xamarin froms/iOS app with msbuild I get:

"<project-file>" (Rebuild target) (1) ->
(_CodesignAppBundle target) -> 
  bin/iPhone/AppStore/OM_App.iOS.app : error : <app-file>: unknown error -1=ffffffffffffffff [<project-file>]

What could this be? How can I fix this?
Thanks!
Nathan