brightline 0 Junior Poster in Training

I had applied exception handing using EnterpriseLibrary 3.0.0.0.
I added the reference for Microsoft.Practices.EnterpriseLibrary.Common,
'Microsoft.Practices.EnterpriseLibrary.ExceptionHanding,
and 'Microsoft.Practices.EnterpriseLibrary.ExceptionHanding.Logging
then when I these references the exception handling worked well,
but when I closed the page and run the page again the following excetion come out:

Could not load file or assembly 'Microsoft.Practices.EnterpriseLibrary.Common, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

If I removed these references and added it again, this exception doesn't happen.
I can't understans what is the wrong.

Thanks in advance.

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