尝试使用pygame OpenGL绘制平面3D网格,不断获取错误1282“无效操作”

我正在尝试创建一个地形,但是我似乎无法让这个网格工作?不断返回此错误:

OpenGL。错误GLError:GLError(err=1282,description=b'无效 操作',基本操作=格伦德,成本=()

import pygame
from pygame.locals import *
from OpenGL.GL import *
from OpenGL.GLU import *
import random

nptx=10
npty=10

def terrain2(): 
    glBegin(GL_QUADS)
    for ye in range(0,npty):
        for xe in range(0,nptx):
            glVertex3f(xe,ye+1,0)
            glVertex3f(xe+1,ye+1,0)
            glVertex3f(xe+1,ye,0)
            glVertex3f(xe,ye,0)
    glEnd()

def main():
    pygame.init()
    display=(800,600)
    pygame.display.set_mode(display, DOUBLEBUF|OPENGL)

    gluPerspective(45, (display[0]/display[1]),0.1,200)
    glTranslatef(0.0,0.0,-5)

    while True:
        for event in pygame.event.get():
            if pygame.event==pygame.quit():
                pygame.quit()
                quit()
        terrain2()
        pygame.display.flip()
main()