[hue emulation] doesn't seem to work properly

if i tell Alexa to switch on or off my lamp, she said, “Lamp doesn’t seem to work properly”
but she turn the Lamp on and also off without problems.
Actual i hve the openhab2 2.5.10-SNAPSHOT (#237)
Any ideas ?

Try removing the lamp from Alexa app then rediscover it.

Thx, but this i tried more times.