Undefined is not an object (evaluating 'Pst.Base64.decode') after upgrade to rc0

When building our Ionic2 RC0 for ios I get the following error and I have no idea what might be. This happened after upgrade to RC0 from Beta11 Ionic2. (which uses ng2 final)

0     949421   error    EXCEPTION: undefined is not an object (evaluating 'Pst.Base64.decode')
1     949422   error    ORIGINAL STACKTRACE:
2     949423   error    urlBase64Decode@

Any idea how to resolve?