I solved the error with the help of the answer in this post:
https://stackoverflow.com/a/28391583/2977169
@Sumoanand:
I also faced similar problem.
This issue occurs if app is not registered properly in google developer console.
I think you have registered app on Google developer Console using production keystore certificate fingerprint(SHA1) where as you are testing it on app which has debug keystore.
Perform following steps:
Create one more client Id using debug keystore certificate fingerprint(SHA1).
Uninstall existing app.
Install app & connect to Google fit.
Check under google fit app & make sure that your app is listed as a connected app (... > Settings > Connected apps > Connected apps & devices).
Now run the above code & it will work !!!
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