The most common formula error you may see in your analysis is that a layer, assumption, indicator, or attribute used by a formula can not be found in the analysis. This can happen if the component is removed, or if the component failed to import properly from a CommunityViz 1 scenario import. If this happens the formula will no longer be able to run. The solution is to add the missing component back into the analysis.
Formulas with errors will display on the Formula tab of the Edit Indicator or Edit Attribute window with an exclamation point (!) next to them.
Other possible errors and their solutions are:
"The value returned by the formula is incompatible with an attribute's data type". This will happen if the formula for a numeric attribute references an analysis component that contains text. You must remove the reference to the incompatible component from the attribute's formula.
"The formula is invalid": this can happen if a formula fails to import correctly from a CommunityViz 1 scenario. Edit the formula to ensure that it is valid.
Other errors: if you receive other errors during formula execution, you should edit and preview the results for the formula that caused the error, to ensure that a valid formula will be stored for that component.