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Alteryx Designer Knowledge Base

Definitive answers from Designer experts.

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Error: Type mismatch in operator +

Created on


I'm getting an error that says "Type mismatch in operator +" in my formula, what does it mean?


This error often means that you're trying to add a number to a string field. If you are trying to concatenate your fields, you need to be sure that all fields being combined are string values. When Alteryx sees a numeric value and a + operator it wants to add the values together as opposed to concatenate. 


There are (at least) two ways to resolve this error:


1) Use a Select Tool to change the field type before feeding the data into your Formula Tool

2) Use the ToString() function to convert the field to a String value within the expression itself


Both solutions are demonstrated within the attached v10.5 sample.