This appears to be two separate error messages.
On the Confirm page, double click the Universal Email server behavior, on the General Tab, make sure that a character set has been chosen.
In either the Orders or the Order Details table you have a column named opt1 that is set to not allow nulls, It looks like the Store Order Details or store order summary behaviors are not set to give that column a value. You should modify that column to allow nulss or set a default value for it in the DB.