120164: The nullability of <value> does not match the nullability of the input layer. Expected <value>, but got <value>.

Description

Nullability for append layer fields must be set the same as the input layer field you want to append to.

Solution

Verify that the nullability of the input layer field is the same as the append layer field.

Visit the REST endpoint for each layer to compare field nullability settings.

For example, http://<domain>:6443/arcgis/rest/services/<serviceName>/FeatureServer/<layerIndex>.