We get the following error when trying to move a portal from one server and installing it on another.

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We have 2 portals and are trying to move them both to a new server.
One of them works ok, but the other one - which works off a virtual directory from the first one - doesn't work (and this is the one which returns the error above).

any ideas welcome,
thanks,
mark.

we are using dnn 5.1.1,
but the error has gone now (just copied all the dnn content files over again and the error dissappeared.)
Not sure why/how it got corrupt.

Although now it just gives a generic server error.

Yes, we still have that file in the BIN folder (version 1.0.6)
But, we are still running on framework 2.0 (due to still using SQL 2000, and DNN 5.1.1)

Our portal which runs off the virtual directory now merely forwards to the DNN site on main root (of IIS)
(also tried putting the virtual directory site on the main root of IIS, but same errors and results).

When deleting the 'system.web.extensions.dll'  file - A configuration error occurs.
When commenting out the assembly line of code (in web config) - it still redirects to the main portal.

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Further Info:  
I believe its recommended to remove old references to old aliases in the database when setting up on a new development server.
– so, on our new database, we did this:

-         Removed portal alias to reference to the live website (in Portals and PortalAlias tables)

-         Also had to remove all references to live portal id on new database ‘portal id 7’ (in modules table)