Unclear exception raised

[hyperfield]

I am running Ford for the first time with the following command line arguments:

ford -d . project-file.md

and this is what happens.

Reading file jacobian2.f90
Reading file omptimestepROW.f90
Reading file jreacterms2.f90
Reading file ompmodel.f90
Reading file ompmethod.f90
Reading file ffun.f90
Reading file jreacterms.f90
Reading file initialdata.f90
Traceback (most recent call last):
  File "/usr/local/bin/ford", line 11, in <module>
    load_entry_point('FORD==6.0.0', 'console_scripts', 'ford')()
  File "/usr/local/lib/python3.6/dist-packages/ford/__init__.py", line 391, in run
    main(proj_data,proj_docs,md)
  File "/usr/local/lib/python3.6/dist-packages/ford/__init__.py", line 342, in main
    project = ford.fortran_project.Project(proj_data)
  File "/usr/local/lib/python3.6/dist-packages/ford/fortran_project.py", line 90, in __init__
    ford.sourceform.FortranSourceFile(os.path.join(curdir,item),settings, preprocessor, ext in self.fixed_extensions,incl_src=html_incl_src))
  File "/usr/local/lib/python3.6/dist-packages/ford/sourceform.py", line 1052, in __init__
    FortranContainer.__init__(self,source,"")
  File "/usr/local/lib/python3.6/dist-packages/ford/sourceform.py", line 672, in __init__
    permission))
  File "/usr/local/lib/python3.6/dist-packages/ford/sourceform.py", line 537, in __init__
    for line in source:
  File "/usr/local/lib/python3.6/dist-packages/ford/reader.py", line 218, in __next__
    raise Exception("Alternate documentation lines can not be inline")
Exception: Alternate documentation lines can not be inline```

I do not seem to understand what this means. Would appreciate some clarification.

Cheers.