All i get is error code 403. I have tested the embed code and it works fine elsewhere, I have set the credential file to the one made GCal3.json.
I see you are new to this - welcome to the forum!
Many people can help but we need information. Like: are you on openluup or vera; what release of the plugin you are using and the full "error" you are seeing. For example, there are several places where a "403" error can possibly occur and the messages are distinct to make troubleshooting easier.
Being able to get a log file is more-or-less critical for anything that is non-obvious. There are several ways; covered in other general vera forums. AltUI has it's own inbuilt capability and there is a Getlog plugin that I created some time ago for vera. You are spoilt for choice :-)
Decide on how to get logs. You will likely need the capability at some point. Simplest I think is GetLog unless you already use ALTUI.
But before you go there: Ahe 403 error usually means that you have not set up calendar access correctly. The documentation is pretty precise BUT google changed the UI's (again) but it should be fairly similar. I would do two things:
1) Verify for me that the test calendar works. It should have come of the very first time you installed GCal3 (assuming you did that in the past day or two you will have release 3.1). If - when you installed the plugin you did not getthe test calendar - then delete the GCal plugin and reinstall it from the marketplace. Veryfy that the test calendar works
2) Go back to your calendar settings - in particular make sure you are sharing the calendar in the manner described in the documentation.
In particular see this discussion. Do you have the google calendar API's enabled for your project ?
http://forum.micasaverde.com/index.php/topic,53035.0.htmlIf you still have issues: set gc_debug to 3 and create a log file.