A value could not be added to the output field; for example, text values cannot be added to numeric fields, and text values cannot be added to text fields if the values are longer than the field length.
In some cases, when a tool encounters multiple cases that result in this message, this message will be included in the tool messages up to a maximum of ten times. The Object ID of all cases will be listed in a text file that is provided in an accompanying message.
If you're using a tool with a field map parameter, change the output field type or other field properties in the field map parameter to accommodate the expected value. If you're using a tool such as the Calculate Field or Calculate Fields (multiple) tool, evaluate the calculation or calculate to a different field that can accommodate the value.