When I try to flutter start any of the example programs widgets, fitness or rendering I get an error like the following:

Downloading Sky Snapshot from the cloud, one moment please...
Downloading Sky Shell from the cloud, one moment please...
[1108/213053:FATAL:loader.cc(21)] Check failed: base::ReadFileToString(path, &source). /home/dmta/flutter/flutter/examples/rendering/./lib/main.dart

The other examples I have tried worked fine.