token list exceeded

I see this error occasionally with ISIS 1.3.0 when running "evalfile(...);"

isis> evalfile("mDOSA.sl");
S-Lang Error: Syntax Error: Token list stack size exceeded: found '??', line 3,
file: ./convertDegToSDSSName.sl


mDOSA.sl calls "() = evalfile("F1.sl");" which calls a set of "() =
evalfile("F*.sl");"...

If I say:
() = evalfile("F1.sl"), I get the token list exceeded error, but if I say
evalfile("F1.sl") without the "() =", I don't get the error.

So I'm guessing that I've run up against some compiler stack?  Am I doing
something wrong?

Thanks,
Rob

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