[EpiData-list] error in CHK file: cannot apply opGTE to missing operands

Hi

I receive the following error with the CHK file coding that follows:

CHECK MOUS >= MOUSTR cannot apply opGTE to missing operands

And here's the coding:

CONSISTENCYBLOCK CHECK "impossible # treated nets" MOUS >= MOUSTR CHECK "impossible # children sleeping under nets" ENFANTS >= DORMI END

I cannot figure out why this is. MOUS, MOUSTR, ENFANTS and DORMI are all names for numerical variables in the REC file. Any assistance (however obvious) would be helpful.

Thank you,

Ruwan