Getting this error message when throwing an Exception in a Web Service - How do get more info to trace/fix this error

Language = C#
Medium - Web Service with  try/catch block

catch block consists of:
  catch
  {
     throw;
  }

When exception is thrown again I get:
Type is not resolved for member 'CIS.Core.Security.SecurityPrincipal,CIS.Core.Security, Version=0.0.0.0, Culture=neutral, PublicKeyToken=2100caacdcc05444'.  

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Runtime.Serialization.SerializationException: Type is not resolved for member 'CIS.Core.Security.SecurityPrincipal,CIS.Core.Security, Version=0.0.0.0, Culture=neutral, PublicKeyToken=2100caacdcc05444'.

Source Error:  An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.  

Web Service is using the SoapHeader to Authenticate the UID/PWD of the calling end user.

Just don't know how to track this error, if I can not walk through it, I don't see how I can fix it without being very, very lucky.

Thanks in advanced,

Marv

Marvin_RoweAsked:
Who is Participating?
 
Richard LeeConnect With a Mentor Software EnthusiastCommented:
If the webservice is part of your solution then you can walk through. Place a breakpoint just before the call to the webservice web method is made and trace into with F11.

Also if the webservice is in the solution, set the project properties to use IIS / Custom server. (Property pages: Custom server & Base Url)

Update your web references (you may have to delete and recreate).
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Marvin_RoweAuthor Commented:
webservice is in the solution in fact is test mode, it's the start-up project.  The throw that is causing the error is within the w/s.  I have a breakpoint at the throw.  Pressing F11 while in the w/s at the throw get this error
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Marvin_RoweAuthor Commented:
Correction: webservice is in the solution, in fact, in test mode, it's the start-up project.
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Marvin_RoweAuthor Commented:
Just found out that CIS is an intra company DLL - sorry

Closing question.
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Richard LeeSoftware EnthusiastCommented:
If I assisted in solving the problem then some points should be awarded. I assume that debugging the webservice provided conclusively that the problem originated elsewhere. I advised on the possibility of debugging the webservice.
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