Required value missing - sourceValue

Try replacing the following:
<values>
   <value>Out</value>
</values>

with:

<values>
  <sourceValues>
    <sourceValue>Out</sourceValue>
  </sourceValues>
  <value>Out</value>
</values>

Do this for all <values> tags in the bucket fields that don't have the <sourceValues> tag. This worked for me and I was able to deploy using Ant.

I don't know why this happened but I just wanted to let you know what worked for me. Hope this helps you.