resource: Include the transformation step in the error message
resource: Include the transformation step in the error message

Fixes #4924

mdhender/hugo,fedelibre/hugo,anthonyfok/hugo,anthonyfok/hugo,mdhender/hugo,gohugoio/hugo,fedelibre/hugo,mdhender/hugo,gohugoio/hugo,anthonyfok/hugo,mdhender/hugo,gohugoio/hugo,fedelibre/hugo,fedelibre/hugo