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I am attempting to re-code some text data in the attribute table using the QGIS Field Calculator tool, but I keep getting an annoying error message: "An Error occured while evaluating the calculation string: "No Root Node! Parsing Failed?"

FYI, I am using the expressions bar, this is happening while in editing mode.

No Root Node! Parsing Failed?

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It is necessary to enclose the string value you wish to calculate in single quotes like this: 'SAMPLE TEXT'

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