Error: Undefined blocking protocol found in the blocking file. Expected 3, found 0.

Question

I updated my Android studio to version 2.3, and then connecting my application to Firebase, it gave me an error:

Error: An unexpected lock protocol found in the lock file. Expected 3, found 0.

Do I need to return to 2.2.3 or is there a way to fix this? I tried to delete the .gradle file in my project, but it still gave me an error.

Answer 1

Delete the folder .gradlefrom the user directory , not from the project.

C:\users\username\.gradle in windows
/home/username/.gradle in Linux 
/users/username/.gradle in Mac

Answer 2

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.

Answer 3

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Answer 4

For linux users: press ctrl + H to show hidden files inside the home directory, because the .gradle directory is usually hidden, and delete the .gradle directory.

After that, you may receive the error message “cannot lock the output of the assembly”, then delete the lock files in the Gradle cache by doing something like this:

find ~/.gradle -type f -name "*.lock" -delete