Save/build Data Area - Signal 10 error

Newly working with NDV and NaturalOne.

We have made a lot of progress on how to get dependencies to work, editing and building projects, etc.

One issue we are experiencing with Data Areas only

When edit/update Data Area and subsequent save/build. We are getting Signal 10 error when builder tries to save Data Area to the server. The Data Area does not save to the server.

This occurs whether we use local project or edit from server directly.

Can someone direct me to more info for this Signal 10 error?

Thank you.