You need to read some documentation, before you jump in. To use the data importer you must first have extracted that data use the exporter.
You cannot complain about bugs if you don't let people see them. I have installed multiple instances of OxWall on their suggested hosts and i haven't had any major issues, mostly human errors on my behalf.
But for people to test these bugs and errors you are talking about you must show us all so the OxWall developers can fix these bugs, otherwise they wont be able to fix such bugs if they have no examples or details.