Why do I get ERROR after editing an widget / segment filter?
Most of the metrics and dimensions in Google Analytics cannot be combined together in API query, if this happens an ERROR is displayed.
Example - When when we use ADWORDS COST and User City, it will return an error.
Then, What should I do ?
To solve this you can group KPIs in different KPI BOARDS, for the situation in above example - use a separate KPI BOARD to analyse the AdWords data.