llvm dev - Aug 2018 - CommandLine Argument in llvm

Hi,

I was writing main.cpp file for command line argument . I am facing this
error:

error: ‘class llvm::Expected<std::unique_ptr<llvm::Module> >’ has no
member
named ‘getError’
   if (error_code ec = m.getError())

I do not which member does this expecting. Please suggest me steps. Here is
my source code.

--------------------------------------------------------------------------------------------------
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ErrorOr.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/raw_ostream.h"
#include <llvm/Support/Error.h>
#include <llvm/IRReader/IRReader.h>
using namespace llvm;
using namespace std;

static cl::opt<string> input(cl::Positional, cl::desc("Bitcode
file"),
cl::Required);

int main(int argc, char** argv)
{
    cl::ParseCommandLineOptions(argc, argv, "LLVM IR to Bytecode \n");
    LLVMContext context;

    ErrorOr<std::unique_ptr<MemoryBuffer>> mb
MemoryBuffer::getFile(input);
    if (error_code ec = mb.getError()) {
        errs() << ec.message();
        return -1;
    }

  Expected<std::unique_ptr<Module>>
m=parseBitcodeFile(mb->get()->getMemBufferRef(), context);
  if (error_code ec = m.getError())
    {
        errs() << "Error reading bitcode: " <<
ec.message() << "\n";
        return -1;
    }

return 0;
}
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