The model Generated the following:

CREATE TABLE `modelo_facultad`.`Alumno` (
  `alu_legajo` CHAR(8) CHARACTER SET  COLLATE  UNSIGNED NOT NULL,
  `alu_nombre` VARCHAR(30) CHARACTER SET  COLLATE  NULL,
  PRIMARY KEY (`alu_legajo`)
)
ENGINE = InnoDB
CHARACTER SET latin1 COLLATE latin1_swedish_ci;

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And The error was:

file source\myx_grt_value.c: line 3307: assertion `dict != NULL' failed
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'COLLATE  UNSIGNED NOT NULL,
  `alu_nombre` VARCHAR(30) CHARACTER SET  COLLATE  ' at line 2