try {
double value = parser.evaluator();
// The new Formula worked well. The user should be informed
// that he should chance the formula. Therefore we throw a EnhancementException.
// We have to find the ID of the formula
throw new EnhancementException(formula, value);
} catch (FormulaVariableNotFoundException fvnfe) {
// If the error appears again --> Throw the error again
if (formula.contains(fvnfe.getVariable())) {
int pos = formula.indexOf(fvnfe.getVariable())
+ fvnfe.getVariable().length();