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Thread添加ppp_device时,运行报错,为什么?

\ | /
- RT -     Thread Operating System
/ | \     4.0.3 build Jul 25 2024
2006 - 2020 Copyright by rt-thread team
lwIP-2.0.2 initialized!
[I/sal.skt] Socket Abstraction Layer initialize success.
[I/at.svr] RT-Thread AT server (V1.3.1) initialize success.
[I/ppp.dev] ppp_device(pp) register successfully.
**no memory for shell
[E/ppp.dev] PPP device initialize failed! ppp_device_recv_tid create failed!
[E/ppp.dev] Creat a thread to creat ppp recieve function failed.
[E/ppp.dev] ppp_device_attach failed. Can't open device(32)
[E/ppp.sample] ppp_device_attach execute failed.**
[D/main] Hello RT-Thread!

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