[plt-scheme] car: expects argument of type <pair>; given ()

It tells you that you are taking the car of an empty list.

Andrey Skylar schreef:

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>I get this error all the time and every time it tells me nothing. 
>Could it be made so that the error also tells you which function made
>the invalid call?  That would be a lot more helpfull.
>
>-Andrey
>
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