OpenLB – Open Source Lattice Boltzmann Code › Forums › on OpenLB › General Topics › STL File not valid › Reply To: STL File not valid April 13, 2020 at 12:16 pm #4922 iJokerifyParticipant Dear Sthavishtha Im using CMake and there is the line inside CMakeLists that runs the code: add_executable(Project ${SOURCE_DIR}/cylinder3d.cpp) and the error still don’t fixed Sincerely iJokerify