compiling 8266 error 'class WiFiServer' has no member named 'accept'

[montecr72]

I'm doing it on platformio, arduino, chip esp-01

When compiling I get an error

src\WebSocketsServer.cpp:677:82: error: 'class WiFiServer' has no member named 'accept'; did you mean '_accept'?

#define ESP8266 // added

What could be the problem?
Thanks in advance.

[jleal52]

Downgrade to 2.3.6.