Right now the Smartsheet formulas will pass through errors that exist in ranges referenced in formulas. This can result in error messages like "#INVALID DATA TYPE" in formulas where that is fundamentally impossible - making trouble shooting much more difficult.
If, instead of opting for passing through any existing error messages, when the formula is referencing a range containing an existing error message it would give a unique #ERROR IN RANGE message, troubleshooting for both new and experienced users would be MUCH simpler.