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连续NLME_JoinRequest申请加入不同的网关,结果返回错误

我在扫描NLME_NetworkDiscoveryRequest扫描网关时,返回不少网关信息,然后依次NLME_JoinRequest尝试加入网络,第一个网关拒绝我的请求,收到拒绝请求后,再次NLME_JoinRequest申请加入第二个网关,这个时候,函数结果返回0xCA的错误,每次都是,我查了一下,0xca是zNwkNoNetworks的错误,请问这是什么原因,怎么解决