It seems like I fixed the problem myself (and it would be infinitely difficult for someone to fix blindly, I think).
For some reason, removing Cucumber caused Spork to cause this error. I don’t understand why, but Spark worked fine ... and now it’s not: /
The solution was to remove spork.
, Spork - . - . - , basename , File.basename(the_string).
, , , , , Rails 3.0.7
Anyhoo, , Spork. , , Spork - promises - - :( , , . , Spork .
, , .