Login Code Not Working

createActivitiesTable = "CREATE TABLE IF NOT EXISTS Activities ( activity_num INTEGER PRIMARY KEY NOT NULL, activityname VARCHAR(40) NOT NULL);";
                    createSubjectsTable = "CREATE TABLE IF NOT EXISTS Subjects ( subject_num INTEGER PRIMARY KEY NOT NULL, subjectname VARCHAR(60) NOT NULL)";
                    //createQuotasTable = "CREATE TABLE IF NOT EXISTS Quotas ( quota_num INTEGER PRIMARY KEY NOT NULL, hrsMinsSecs INTEGER(6) NOT NULL )";
                    createStudentsTable = "CREATE TABLE IF NOT EXISTS Students ( student_num INTEGER PRIMARY KEY, studentname VARCHAR(60) NOT NULL, account_num INTEGER NOT NULL )";
                    createAccountsTable = "CREATE TABLE IF NOT EXISTS Accounts ( account_num INTEGER PRIMARY KEY, username VARCHAR(40) NOT NULL, passcode VARCHAR(40) NOT NULL, type VARCHAR(7) NOT NULL, FOREIGN KEY (account_num) REFERENCES Students (account_num) ON UPDATE CASCADE ON DELETE CASCADE )";
                    //createLogsTable = "CREATE TABLE IF NOT EXISTS Logs ( student_num INTEGER NOT NULL, subject_num INTEGER NOT NULL, activity_num INTEGER NOT NULL, hrsMinsSecs INTEGER(6) NOT NULL, PRIMARY KEY (student_num, subject_num, activity_num, hrsMinsSecs) )";
                    //createStudentsAndSubjectsTable = "CREATE TABLE IF NOT EXISTS StudentsAndSubjects ( student_num INTEGER NOT NULL, subject_num INTEGER NOT NULL )";
                    //createStudentsSubjectsAndActivitiesTable = "CREATE TABLE IF NOT EXISTS StudentsAndSubjects ( student_num INTEGER NOT NULL, subject_num INTEGER NOT NULL, activity_num INTEGER NOT NULL, PRIMARY KEY (student_num, subject_num, activity_num, hrsMinsSecs) )";

                    using (dbConnect)
                    {
                        dbConnect.BeginTransaction();

                        //Create tables
                        dbConnect.Execute(createStudentsTable);
                        dbConnect.Execute(createAccountsTable);
                        //dbConnect.Execute(createLogsTable);
                        //dbConnect.Execute(createQuotasTable);
                        //dbConnect.Execute(createStudentsAndSubjectsTable);
                        //dbConnect.Execute(createStudentsSubjectsAndActivitiesTable);
                        dbConnect.Execute(createSubjectsTable);
                        dbConnect.Execute(createActivitiesTable);