This situation might be similar to my case ::
It might not be the problem with the C3 runtime but the Cordova plugin doesn't support the CLI version 8.0.0..
You will have no problem using Cocoon.IO though as it doesn't use the latest Cordova CLI version.
Although, you'll have problems with updated ones like the Construct 3 Build Service and Phonegap.
That's what I've gathered from my tests. Although, I could be wrong. But I just want to give my hypothesis on the matter as the error report is quite similar to mine.
Also, the other way around will also get an error. Older Cordova Version supporting a newer Cordova Plugin will also result an error.
So the C3runtime is not supported at the moment with Cocoon.IO.
Because of the 'cordova-plugin-file', which the new runtime is using is using a latest version which doesn't work with older Cordova CLI versions.
I also encountered it here, on this closed bug report of mine ::
My point is that this may be only a conflict between cordova plugin versions and cordova cli versions. Not the C3runtime. Although I could be wrong, this is just based on my tests.