no suitable userdefined conversion from

[kunoh]

Severity Code Description Project File Line Suppression State
Error (active) E0312 no suitable user-defined conversion from "Concurrency::taskConcurrency::details::_BadContinuationParamType" to "Concurrency::task" exists Http_test c:\Users\heltbork\source\repos\Http_test\Http_test\Http_test.cpp 34

I'm basically just copy/pasted this example
https://github.com/Microsoft/cpprestsdk/wiki/Getting-Started-Tutorial

But this line is giving me problem
pplx::task requestTask = fstream::open_ostream(U("results.html")).then([=](ostream outFile)

Is there anything I could be missing? Or is this example broken?

[zhouguoguo]

I made following change and error is removed:

return concurrency::task<size_t>(response.body().read_to_end(fileStream->streambuf()));
//return response.body().read_to_end(fileStream->streambuf());