Extension not working

```
ocamlmerlin error: File "_none_", line 1:
Error: I/O error: ../../bisect.exclude: No such file or directory
```

```
pwd
/home/pc/workarea/software/myproject

```
```
which ocamlmerlin
/home/pc/.opam/4.06.1/bin/ocamlmerlin
```

What exactly am I supposed to do about this? What's a bisect.exclude?