Compile Error in combination with AsyncElegantOTA

[Norair1997]

It doesn't compile when I use AsyncElegantOTA. I get this:

c:/users/nmika/appdata/local/arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/2.5.0-4-b40a506/bin/../lib/gcc/xtensa-lx106-elf/4.8.2/../../../../xtensa-lx106-elf/bin/ld.exe: C:\Users\nmika\AppData\Local\Temp\arduino-sketch-393435F02AC9FC2C1FFA53DAE9EA71CC\libraries\WebSockets\WebSockets.cpp.o: in function WebSockets::base64_encode(unsigned char*, unsigned int)': c:\Users\nmika\Documents\Arduino\libraries\WebSockets\src/WebSockets.cpp:577: undefined reference to sha1(String const&, unsigned char*)' c:/users/nmika/appdata/local/arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/2.5.0-4-b40a506/bin/../lib/gcc/xtensa-lx106-elf/4.8.2/../../../../xtensa-lx106-elf/bin/ld.exe: C:\Users\nmika\AppData\Local\Temp\arduino-sketch-393435F02AC9FC2C1FFA53DAE9EA71CC\libraries\WebSockets\WebSockets.cpp.o: in function WebSockets::acceptKey(String&)': c:\Users\nmika\Documents\Arduino\libraries\WebSockets\src/WebSockets.cpp:582: undefined reference to sha1(String const&, unsigned char*)'