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我正在使用 URI.unescape来转换文本,不幸的是我遇到了奇怪的错误:

 # encoding: utf-8
 require('uri')
 URI.unescape("%C3%9F?")

结果是

 C:/Ruby193/lib/ruby/1.9.1/uri/common.rb:331:in `gsub': incompatible character encodings: ASCII-8BIT and UTF-8 (Encoding::CompatibilityError)
    from C:/Ruby193/lib/ruby/1.9.1/uri/common.rb:331:in `unescape'
    from C:/Ruby193/lib/ruby/1.9.1/uri/common.rb:649:in `unescape'
    from exe/fail.rb:3:in `<main>'

为什么？