Entry point was not found

I was in the process of implementing Telerik's Kendo UI for ASP.NET MVC into a mixed ASPX / MVC 4 application when I ran into a problem that stopped me dead in my tracks for longer than I care to admit. Here is the main portion of the error message:

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Server Error in '[my]' Application.

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Entry point was not found.

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.EntryPointNotFoundException: Entry point was not found.

(refer to the bottom of this post for the full error message)

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