If you don't have WEIGHT as a question in your file, you will see a warning in your meta data transformation saying "No variable has been marked as respondent weight". See image below:
To avoid the import error, you have to click on your right mouse button and a list appears what can be done. Click on the fourth option "Create Weight variable"
After you selected that option, Dapresy will ask you if you would like to create a new one or if you would like to select an existing question to become your Weight.
In case you choose select an existing, please note that you will need to have numeric open questions to be able to use this.
What else can you do during the meta data transformation?
All done? Continue!