REPL only persists if I open file from same directory

[cookEbox]

Hi,
Bit of a nvim noob here. Using Iron in conjunction with nvim-lspconfig and haskell-language-server (and some other plugins). When I open a project in netrw and then navigate to the file to open then when I open the repl it flashes up loads and closes down. If I open the file from the same directory it works fine.
It also flashes up for a second if I open for example nvim app/Main.hs.
Any help would be great but only a light annoyance.
Thanks
Nick