[plt-scheme] Problems with the require expression in PLT-Scheme 4.0

To whom it may concern,

I have just upgraded to 4.0 and I am having issues with the require
statement in my exsisting files.

The following for example "(require (planet "sicp.ss" ("soegaard" "sicp.plt"
1 0)))" results in this error "string->number: expects argument of type
<string>; given #f".

How do I correct this?

Regards,
Joshua Ewulo
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