What is the Error message?
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It says calculation contains error and the error that it shows is "All fields must be aggregate or constant when usning table calculation and functions"
But the time stamp that are in the table are in form of double(data type), where as Tableau shows it as float. Is there a way to change the Data type to int permanently, mean I can change the property of the field. Meanwhile DATEADD('second',int([trialstart]),#January 1,1970# ) did worked for me, but why it should need int() conversions on top of double data types at source and why data type is showing float at Tableau level.
Can you post the formula? Usually that error comes up when you are mixing row-level calculations within aggregate calcs.