Have you loaded an old save made using one of the non-Steam versions?
Viewing post in Tales From The Unending Void comments
That's really weird, ep005_taera_body is a known issue, but I haven't had reports of the ones you've posted as they should be defined in the Steam edition.
As a workaround the variables can be defined via the developer console:
- Load save right before the error
- Open the developer console by pressing Shift+O
- Type the following and press enter: $ ep005_taera_body=False