MySQL error: Can’t create table ‘tablename’ (errno: 150) can occur when you, for example, upload a backup and MySQL is powered to create table 1 which refers to table 2, which essentially does not exist yet. You can solve by inserting the lines at the beginning in the backup:
SET FOREIGN_KEY_CHECKS = 0;
And at the very end:
SET FOREIGN_KEY_CHECKS = 1;