Could not load file or assembly

<%@ Register TagPrefix="cc1" Namespace="sstchur.web.SmartNav"
Assembly="sstchur.web.SmartNav" %>

the above code is given by me. it shows the following error.

Could not load file or assembly 'sstchur.web.SmartNav' or one of its
dependencies. The system cannot find the file specified.


can u give me a soluyion why iam getting this error and how to rectify
this.


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