error while installing merb

[Asif Ali]

I got an error while installing merb

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ERROR:  Error installing gem json-1.0.1.gem[.gem]: ERROR: Failed to build
gem native extension.
Gem files will remain installed in
C:/InstantRails/ruby/lib/ruby/gems/1.8/gems/j
son-1.0.1 for inspection.

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Can someone tell me what the error is and how to fix it ?

Dude
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