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

I had the same error after trying to use the 2.0.

I solved it by reverting some gradle changes:

1/3:

Changing:

classpath 'com.android.tools.build:gradle:2.0.0-alpha1'

By:

classpath 'com.android.tools.build:gradle:1.2.3'

2/3:

Changing:

buildToolsVersion '23.0.2'

By:

buildToolsVersion "21.1.2"

3/3: (in <project folder>/.idea/gradle.xml)

And:

<option name="gradleHome" value="$APPLICATION_HOME_DIR$/gradle/gradle-2.8" />

By:

<option name="gradleHome" value="$APPLICATION_HOME_DIR$/gradle/gradle-2.4" />

I don't know what line is exactly the origin of the error, but with this three changes it was solved.

Hope that it helps you :)

Answer 2

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.

Answer 3

Disable the Instant Run option in Android Studio. Instructions are in the Android Studio Instant Run documentation.

Instant Run tries to do hot swapping of your code; this causes the application class to be moved.

To disable Instant Run Go to File --> Settings--> Build,Execution,Deployment -->Instant Run ---> uncheck "Enable instant run"

Answer 4

I just needed to reboot my device. Tried everything else first unfortunately so wasted hours.