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# The A/B test JS file is missing

### Problem

After the initial installation you might notice that, if you checked the A/B testing feature when including the tracking script, the domain.ab.js file is missing, returning "404 Not Found".

### Cause

This happens because **the AB** **testing file is only generated once at least one AB test has been created** and published.

### Solution

#### A. If you are not using AB tests, include the tracking snippet without this feature

Go to **Domains->Wrench icon (for the domain you want to change the tracking snippet) -> Include the tracking pixel**.

Disable the A/B tests feature and copy the tracking code. Update the tracking snippet on your domain.

![Removing the A/B test code from the tracking snippet](/files/EZd503VwNkTtTVgHhcOM)

**B. Create and publish an empty test**

If you do plan to use A/B tests but don't want to create one yet, you can still generate the A/B test file by going to **A/B tests -> Add new test (bottom right) -> Publish Tests**

![Creating an empty A/B test to generate the missing ab.js file](/files/BTKjAryzK9uIbkMPuwDm)