Unable to instantiate application com.android.tools.fd.runtime.BootstrapApplication ?Android

Question

I updated my Android Studio to version 2.0. But I had a problem, I don\'t know why?

The important error info:

Unable to instantiate applicati

Answer 1

In some Android devices with versions before OS 5.0 we get the error message:

Caused by: java.lang.ClassNotFoundException: Didn't find class "com.android.tools.fd.runtime.BootstrapApplication

We must disable "Instant Run".

Go to File > Settings > Built, Execution, Deployment > Instant Run

Then disable the option Enable Instant Run to hot swap code.