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Thanks for the reply.

(1) Regarding your first suggestion, do you mean I can add an un-numbered figure with a caption right below it without using the \begin{figure}...\caption{...} end{figure} code?
If yes, please give me a sample code that shows how this could be done?

(2) Here is the error ...

Following the finishing of Chapter 5, the part III of my thesis starts with an Overview that is followed by the start of Chapter 6. The Overview (which is neither part of Chapter 5 nor part of Chapter 6) is composed of some text and two figures. The two figures in the Overview of Part III are ...