Not working in hugo v0.58.2

[mado-m]

In hugo v0.42.2,

$ hugo version
Hugo Static Site Generator v0.42.2 darwin/amd64 BuildDate: 2018-06-28T12:36:21Z
$ hugo

                   | EN
+------------------+----+
  Pages            | 88
  Paginator pages  |  5
  Non-page files   |  0
  Static files     | 69
  Processed images |  0
  Aliases          | 10
  Sitemaps         |  1
  Cleaned          |  0

Total in 160 ms

But, in hugo v0.58.2

$ hugo version
Hugo Static Site Generator v0.58.2/extended darwin/amd64 BuildDate: unknown
$ hugo
# terminal
Building sites … WARN 2019/09/15 10:14:22 Page's .Hugo is deprecated and will be removed in a future release. Use the global hugo function.
WARN 2019/09/15 10:14:22 Page's .RSSLink is deprecated and will be removed in a future release. Use the Output Format's link, e.g. something like:
    {{ with .OutputFormats.Get "RSS" }}{{ .RelPermalink }}{{ end }}.
WARN 2019/09/15 10:14:22 Page's .Dir is deprecated and will be removed in a future release. Use .File.Dir.
ERROR 2019/09/15 10:14:22 open /play2-hands-on/docs/play2.3-slick2.1/introduction.html: is a directory
ERROR 2019/09/15 10:14:22 open /play2-hands-on/docs/play2.5-scalikejdbc2.5/introduction.html: is a directory
ERROR 2019/09/15 10:14:22 open /play2-hands-on/docs/play2.5-slick3.1/introduction.html: is a directory
ERROR 2019/09/15 10:14:22 open /play2-hands-on/docs/play2.6-scalikejdbc3.2/introduction.html: is a directory
Total in 157 ms
Error: Error building site: failed to render pages: open /play2-hands-on/docs/play2.4-slick3.0/introduction.html: is a directory

[mado-m]

Latest v0.62.1 doesn't work either.