Some days ago, after a regular 'git pull', 'rake guides' started to
fail with the following error message:
['Normal' guides compile fine.]
66:in `find_template': Missing template credits.erb.textile in view
path ./guides/rails_guides/../source (ActionView::MissingTemplate)
Of course, 'credits.erb.textile' _is_ located in 'guides/source/'.
How can I fix this?