This warning appears when you try to start a translation workflow without there being a target language in the workflow.

You resolve it by entering a target language into the workflow.

To set a target language in the workflow:

1. Double-click the Language field to open the Language Sets dialog.
2. Choose the correct Language Set for this translation job.
3. Drag-and-drop the appropriate language to the Language field.

NOTE: Each Language Set contains its own Translation Memory database. Therefore, if you have multiple Language Sets, it is important to select the target language from the correct Set.