Hi Mario,
Thanks very much for your reply.
The gateway working on JN5169 and our host, I saw the error that made me feel the RAM maybe is not enough.
The RAM and FLASH size are showed as below:

The remaining RAM is : (28725 + 2500) / 1024 ≈ 30.5K Am I right?
And what more information woud you want, Please feel free tell me.
Thanks Again.