I get this error in Firefox when I (try to) implement password
encryption as per Agile Web Development.

I put "require 'digest/sha2'" at the top of my user controller as it
suggests, but when I try to edit then save a user record, I get the
message in the subject of this post.

The Ruby language installation has the ../digest/sha2 subdirectory, so
am I supposed to tell rails where it is, or do something else to make
it available?

Thanks in advance for any help. --Fred

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