Can u share the screen shot of that message and the the calculation you have written.
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This is due to calculated fields often get trashed , when you switch to a new data source. It happens mostly when you rename your calculated fields.
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This happened in my data source today. I fixed it by creating a new calc, pasting the formula from the old calc into the new calc, deleting the old calc, then renaming the new calc to the old calc's name.