*Please i get this error below when i try to carry out these calculation.
Please i need help on resolving it.
${calculations}+${calculations_001}+${calculations_002}+${calculations_003}+${calculations_004}+${calculations_005}+${calculations_006}
if(${calculation},<=5,“Covid-19 not Present”,if(${calculation}<=7,“mid covid stage”,if(${calculation}<9,“severe”,“very severe”)))
FormLogicError: Could not evaluate: if( /model/instance[1]/data/calculation ,<=5,“Covid-19 not Present”,if( /model/instance[1]/data/calculation <=7,“mid covid stage”,if( /model/instance[1]/data/calculation <9,“severe”,“very severe”))), message: The expression is not a legal expression. (line: undefined, character: undefined)