Failed to send a 9 message to nehelper: <dictionary: 0x2033a7440> { count = 1, transaction: 0, voucher = 0x0, contents =
“XPCErrorDescription” => <string: 0x2033a75d8> { length = 18, contents = “Connection invalid” }
}
NEHotspotConfigurationHelper failed to communicate to helper server.
Error connecting to device AP: internal error. - Error Domain=NEHotspotConfigurationErrorDomain Code=8 “internal error.” UserInfo={NSLocalizedDescription=internal error.}

解决方法(亲测有效)

• 在项目 signing&Capabilities --> Capability 添加 Hotspot
  再运行项目，控制台就不会出现这个错误信息了
  

参考链接：NEHotspotConfigurationErrorDomain Code=8 “internal error.” - stack overflow