@deniss777, FastLED 3.5.0?
C:\Users\ADMIN\Documents\Arduino\libraries\FastLED-3.5.0\src/platforms/esp/8266/clockless_esp8266.h: In instantiation of 'static bool ClocklessController<DATA_PIN, T1, T2, T3, RGB_ORDER, XTRA0, FLIP, WAIT_TIME>::writeBits(uint32_t&, uint32_t) [with int BITS = 8; int DATA_PIN = 6; int T1 = 20; int T2 = 50; int T3 = 30; EOrder RGB_ORDER = RGB; int XTRA0 = 0; bool FLIP = false; int WAIT_TIME = 85; uint32_t = unsigned int]':
C:\Users\ADMIN\Documents\Arduino\libraries\FastLED-3.5.0\src/platforms/esp/8266/clockless_esp8266.h:113:27: required from 'static uint32_t ClocklessController<DATA_PIN, T1, T2, T3, RGB_ORDER, XTRA0, FLIP, WAIT_TIME>::showRGBInternal(PixelController<RGB_ORDER>) [with int DATA_PIN = 6; int T1 = 20; int T2 = 50; int T3 = 30; EOrder RGB_ORDER = RGB; int XTRA0 = 0; bool FLIP = false; int WAIT_TIME = 85; uint32_t = unsigned int]'
C:\Users\ADMIN\Documents\Arduino\libraries\FastLED-3.5.0\src/platforms/esp/8266/clockless_esp8266.h:41:27: required from 'void ClocklessController<DATA_PIN, T1, T2, T3, RGB_ORDER, XTRA0, FLIP, WAIT_TIME>::showPixels(PixelController<RGB_ORDER>&) [with int DATA_PIN = 6; int T1 = 20; int T2 = 50; int T3 = 30; EOrder RGB_ORDER = RGB; int XTRA0 = 0; bool FLIP = false; int WAIT_TIME = 85]'
C:\Users\ADMIN\Documents\Arduino\libraries\FastLED-3.5.0\src/platforms/esp/8266/clockless_esp8266.h:38:15: required from here
C:\Users\ADMIN\Documents\Arduino\libraries\FastLED-3.5.0\src/platforms/esp/8266/clockless_esp8266.h:55:27: warning: ISO C++17 does not allow 'register' storage class specifier [-Wregister]
55 | for(register uint32_t i = BITS; i > 0; --i) {