[plt-scheme] access from an uncertified context to unexported variable from module

I am trying to eliminate the following error:

  compile: access from an uncertified context to unexported variable 
from module:
  "/Applications/PLT Scheme Full 
v4.1.0.3/collects/srfi/42/extra-generators.scm" in: indices->list

Error messages says indices->list is unexported, but it is in fact 
provided from the module
in which it is defined. Thus something else must be wrong. What should I 
be looking for?

-- 
Jens Axel Søgaard