Error Code: Mashup Exception Expression Error

[Anonymous]

Hello I am having issue with Data Flows Error Code: Mashup Exception Expression Error, Error Details: Couldn't refresh the entity because of an issue with the mashup document MashupException.Error: Expression.Error: We couldn't convert to Logical. Details: Reason = Expression.Error;Detail = SERIALIZED;Microsoft.Data.Mashup.Error.Context = User (Request ID: 8725e479-e21e-43b2-8b64-a6a5a255e3ff). can you help me fix this issue? 

[lbendlin]

Find the column that you have set to Yes/No type and change it to Text. Then find out which of the values is not convertible (or is blank)