Encounter "GENERAL ERROR" when rendering

What makes general error when try render certain section in the timeline and how to over come it or prevent it ?

It can be any section. In fact it occurred in my original project. In order not to spoil my original project, I started copying section by section and render it bit by bit. And I found out it can happen to any section. I discovered that there are certain parts when I add transition and render it, then the message "general error" will show. So I cannot put any transition on that part. And I have to undo it. As far as my scratch disk, I am using external hard disc 1 tb, but left only 82 gb.
Thks

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