build examples error

[XYLongzzZ]

examples/EchoServer.cpp:56:6: error: no matching function for call to 'uWS::TemplatedAppBase<false, uWS::CachingApp >::ws<main()::PerSocketData>(const char [3], )'
}).listen(9001, [](auto listen_socket) {
^
In file included from examples/EchoServer.cpp:2:
src/App.h:272:32: note: candidate: 'template BuilderPatternReturnType&& uWS::TemplatedAppBase<SSL, BuilderPatternReturnType>::ws(std::string, uWS::TemplatedAppBase<SSL, BuilderPatternReturnType>::WebSocketBehavior&&) [with UserData = UserData; bool SSL = false; BuilderPatternReturnType = uWS::CachingApp]'
BuilderPatternReturnType &&ws(std::string pattern, WebSocketBehavior &&behavior) {
^~
src/App.h:272:32: note: template argument deduction/substitution failed:
examples/EchoServer.cpp:56:6: note: cannot convert '{((uWS::CompressOptions)((short unsigned int)(146 | 3840))), ((100 * 1024) * 1024), 16, ((100 * 1024) * 1024), false, false, true, nullptr, main()::<lambda(auto:18)>{}, main()::<lambda(auto:19*, std::string_view, uWS::OpCode)>{}, main()::<lambda(auto:20*, std::string_view, uWS::OpCode)>{}, main()::<lambda(auto:21*)>{}, main()::<lambda(auto:22*, std::string_view)>{}, main()::<lambda(auto:23*, std::string_view)>{}, main()::<lambda(auto:24*, int, std::string_view)>{}}' (type '') to type 'uWS::TemplatedAppBase<false, uWS::CachingApp >::WebSocketBehavior<main()::PerSocketData>&&'
}).listen(9001, [](auto *listen_socket) {