Error 20000 occurs when there is a job with a data collection task but no survey was specified, preventing proper download of the job. This is very rare and suggests the task was accidentally altered by a Salesforce administrator as it is not normally allowed.
- Confirm that the Survey object is set to Public Read Write under Sharing Settings in the Setup Menu.
- Confirm that you are using the correct version of the mobile app.
- Rebuild the job, making sure the data collection task is using a valid survey and try again.
- Report this error and the problem job to TaroWorks Support.