[Libmesh-users] Error reading gmesh file

[Nikrouz <nik...@gm...>]

Dear All,

I am highly thankful for the help of all of member of this mailings list.

I have made a very simple mesh file with gmesh software, but I can not 
read it by example code(introduction/ex1).

I faced with this error:

*poiseuille4@poiseuille4-pc:~/samples_libmesh/samples_intro/ex1-0$ 
./example-opt d 3 untitled.msh **
**Error: Unknown msh file version 4**
**Stack frames: 9**
**0: libMesh::print_trace(std::ostream&)**
**1: libMesh::MacroFunctions::report_error(char const*, int, char 
const*, char const*)**
**2: libMesh::GmshIO::read_mesh(std::istream&)**
**3: libMesh::GmshIO::read(std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const&)**
**4: libMesh::NameBasedIO::read(std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const&)**
**5: libMesh::UnstructuredMesh::read(std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const&, void*, bool, bool)**
**6: ./example-opt(+0x157c4) [0x55f7b133f7c4]**
**7: __libc_start_main**
**8: ./example-opt(+0x15b5a) [0x55f7b133fb5a]**
**[0] ../LIBMESH/src/mesh/gmsh_io.C, line 216, compiled Mar 22 2019 at 
21:22:33**
**--------------------------------------------------------------------------**
**MPI_ABORT was invoked on rank 0 in communicator MPI_COMM_WORLD**
**with errorcode 1.**
**
**NOTE: invoking MPI_ABORT causes Open MPI to kill all MPI processes.**
**You may or may not see output from other processes, depending on**
**exactly when Open MPI kills them.*

How can I solve this issue?

Thanks everybody,