ERROR: Some of the system data from sql/system.sql could not be added. Check the SQL file to make sure there are no syntax errors in it.

If you have installed osDate previously, some of this system data may already exist, in which case you may not need to do anything. Or, you can return to the previous step, choose a different table prefix, and try this step (insertion of sample data) again.
ERROR: Some of the sample data from sql/sample_data.sql could not be added. Check the SQL file to make sure there are no syntax errors in it.

If you have installed osDate previously, some of this sample data may already exist, in which case you may not need to do anything. Or, you can return to the previous step, choose a different table prefix, and try this step (insertion of sample data) again.