使用kpu，第一次运行脚本正常，第二次运行提示kpu:load error:6。 发现只有把串口拔掉，再次插上才可以。请问是什么原因 要如何避免？
程序：
`import sensor,image,lcd,time
import KPU as kpu
lcd.init(freq=15000000)
sensor.reset()
sensor.set_pixformat(sensor.RGB565)
sensor.set_framesize(sensor.QVGA)
#sensor.set_hmirror(1)
sensor.set_vflip(1)
sensor.set_windowing((224, 224))
sensor.set_brightness(2)
sensor.set_contrast(-1)
sensor.set_auto_gain(1)
sensor.run(1)
clock = time.clock()
classes = [‘raccon’]
task = kpu.load(0×300000)
anchor = (1, 1.2, 2, 3, 4, 3, 6, 4, 5, 6.5)
a = kpu.init_yolo2(task, 0.17, 0.3, 5, anchor)
while(True):
clock.tick()
img = sensor.snapshot()
code = kpu.run_yolo2(task, img)
print(clock.fps())
if code:
for i in code:
a=img.draw_rectangle(i.rect())
a = lcd.display(img)
print(i.classid(),i.value())
for i in code:
lcd.draw_string(i.x(), i.y(), classes[i.classid()], lcd.RED, lcd.BLUE)
lcd.draw_string(i.x(), i.y()+12, ‘%f1.3’%i.value(), lcd.RED, lcd.BLACK)
else:
a = lcd.display(img)
a = kpu.deinit(task)`
报错信息：
