Unexpected path structure for module

I have a long term problem using apropos():

julia> apropos("interpolate")
Base.@async
Base.Regex
Base.@eval
Base.Threads.@spawn
DocStringExtensions.Abbreviation
DocStringExtensions.interpolation
MacroTools.@qq
MacroTools.@q
ERROR: Unexpected path structure for module source: /Users/Thomas/Documents/Julia/Extensions/Extensions.jl

I don’t see anything special inside my Extensions module. What should I do?

Thanks