Message: ArcGIS Online Feature Service Writer: 'addResults' error for a feature in 'LAYER NAME'. The error code from the server was '1000' and the message was: 'Arithmetic overflow error converting expression to data type nvarchar.
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Solution: A field is not being converted to the proper datatype (in this case a varchar). Use a StringFormatter to convert it to the type.
Getting this error when writing to AGOL (original data from CSV), however there are many fields and it’s not being specific as to which field/feature.